Answer:
Conclusion
Explanation:
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Answer:
Nuclear Regulatory Commission
Answer the following questions about the element selenium, Se (atomic number 34). b) Write the complete electron configuration for a selenium atom in the ground state. Indicate the number of unpaired electrons in the ground-state atom, and explain your reasoning. c) In terms of atomic structure, explain why the first ionization energy of selenium is i) less than that of bromine (atomic number 35), and ii) greater than that of tellurium (atomic 52).
Answers and Explanation:
b) Complete electron configuration of Se:
1 s² 2 s²p⁶ 3 s²p⁶ 4 s²p⁴
Se has 4 energy levels, with an incomplete 4th level (they are necessary 2 electrons to complete p orbital in the 4th level).
c) The first ionization energy of Se
i) is less that of bromine (Br) because the first ionization energy increases from left to right in a period in the Periodic Table. Se and Br are in the same period, and Se is located to the left of Br so Se has lesser ionization energy than Br.
ii) is greater than that of tellurium (Te) because the first ionization energy decreases from top to bottom in a group in the Periodic Table. Se and Te are in the same group, and Se is at the top of Te. Hence, Se has a greater first ionization energy than Te.
Complete electron configuration of Selenium is [tex]\rm 1s^2\;2s^2\;2\;p^6\;3\;s^2\;3\;p^6\;4\;s^2\;4\;p^4[/tex]
The first ionization energy of selenium is less than that of bromine as
Se and Br belong to same period.
The first ionization energy of selenium greater than that of tellurium as
Se and Te belong to same group.
Se has been a nonmetal with atomic number 34.
b. The complete electron configuration of Selenium has been given as:
[tex]\rm 1s^2\;2s^2\;2\;p^6\;3\;s^2\;3\;p^6\;4\;s^2\;4\;p^4[/tex]
The number of unpaired electrons in the ground state has been 2, as p sub shell occupies 6 electrons. The presence of 4 electrons made 2 unpaired electrons available.
c. The first ionization energy has been the amount of energy required to remove an electron form the ground state of the atom. In the periodic table on moving down the group there has been an decrease in the first ionization energy with the decrease in nuclear attraction on the outer most shell.
On moving from left to right, there has been an increase in first ionization energy with the increase in attraction force due to the increase electron in a shell.
Se and Br belong to same period. Since Br is located right to Se, Se has lesser ionization energy than Br.Se and Te belong to same group. With Te present below Se, it has lesser ionization energy than Se.For more information about selenium, refer to the link:
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Which phrase describes how metamorphic rocks form?
Answer:
Metamorphic rocks are the rocks that arise from the conversion of existing rock types in a process called metamorphism, means changing of forms. Metamorphic rocks are formed from the other rocks that are changing because of heat or pressure applied. One of this example is the Earth movements that causing rocks to deeply bury or squeezed which will make the rocks heated and put under great pressure. They are not melting but the minerals they are containing are changed chemically that will form metamorphic rocks. Sometimes other rocks are formed when the others are close to some molten magma and getting heated.
If im wrong correct me
What type of force should be applied on a football to move it forward?
Balanced force in backward direction
Unbalanced force in forward direction
Non-contact force in backward direction
Gravitational force in downward direction
Answer:
unbalanced force
Explanation:
Answer:
unbalenced ehhhhhh hi
Explanation:
how many significant figures are in the number 0.00346
Answer:
3
Explanation:
Significant figures are the number of digits in a value, often a measurement, that to the degree of accuracy of the value. All non-zero numbers ARE significant. ...
Zeros between two non-zero digits ARE significant. ...
Leading zeros are NOT significant. ...
Trailing zeros to the right of the decimal are significant. ...
Trailing zeros in a whole number with the decimal shown ARE significant.contributes
Answer: 3 significant figures
Explanation:
Particles emitted from metals caused by high frequency light are
O photons
* electrons
O protons
O neutrons
How many ways can 8642 be arranged
Answer:
In 100 ways
Explanation:
The energy needed for the following process is 1.960 × 104 kJ/mol: Li(g) → Li3+(g) + 3e− If the first ionization energy of lithium is 5.20 × 102 kJ/mol, calculate the second ionization energy of lithium—that is, the energy required for the process: Li+(g) → Li2+(g) + e− A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogen-like ion are given by En = −(2.18 × 10−18 J) (Z2)(1/n2) where En is the energy of the electron in the hydrogen-like ion, n is the principal quantum number, and Z is the atomic number of the element. Second ionization energy of lithium: × 10 kJ/mol (Enter your answer in scientific notation)
Answer:
Second Ionization energy, IE₂ = 7.27 x 10³ kJ/mol
Explanation:
Using En = -2.18 x 10¹⁸ J (Z²)(1/n²)
Z = atomic number; n = energy state of electron
Lithium has atomic number, Z = 3
Energy for n = 1:
E₁ = -2.18 x 10¹⁸ J (3²)(1/1²) = -1.962 x 10⁻¹⁷ J
When an electron is completely remove from an atom, n = ∞
Energy for n = ∞:
E∞ = -2.18 x 10¹⁸ J (3²)(1/∞²) = 0 J
Energy absorbed by the electron in order to be removed from the atom completely, ΔE = E∞ - E₁
ΔE = 0 - (-1.962 x 10⁻¹⁷ J) = 1.962 x 10⁻¹⁷ J = 1.962 x 10⁻²⁰ kJ
Ionization energy in kJ/mole of Li²⁺ ions, IE₃ is then calculated thus:
1 mole of Li²⁺ ions contains 6.02 x 10²³ ions
Ionization energy in kJ/mole of Li²⁺ ions = 1.962 x 10⁻²⁰ kJ x 6.02 x 10²³ = 1.185 x 10⁴ kJ/mol
Total energy, Etotal = IE₁ + IE₂ + IE₃
Second Ionization energy, IE₂ = Etotal - ( IE₁ + IE₃
IE₂ = 1.960 x 10⁴ kJ/mol - (520 kJ/mol + 1.185 x 10⁴ kJ/mol)
IE₂ = 7.27 x 10³ kJ/mol
Do hot things, like water or magma, always rise?
Answer:
Explanation:
No not always but it is more likely they will
An atom of Silver loses three electrons, what is its charge?
Answer:
+3
Explanation:
If an atom loses electrons, it becomes positive. Because silver loses 3 electrons, the charge becomes positive 3.
What element has the following electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d8?
Answer:
Explanation:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d⁸
The element is Darmstadtium . It is a d block element . Its symbol is Ds . Its atomic no is 110 .
The element having the given electronic configuration with atomic number 110 is Darmstadtium (Ds).
From the electronic configuration, the number of electrons present in the atom can be calculated.
The number of electrons in the given electronic configuration are :
2+2+6+2+6+2+10+6+2+10+6+2+14+10+6+2+14+8
The number of electrons in the given configuration = 110
The number of electrons in the atoms has been equal to the atomic number. The element having the atomic number 110 is Darmstadtium.
The element belongs to the d block with the symbol Ds. It has been an artificially produced element.
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What should u do if a girl makes a move on you?
Phosphoric acid (H3PO4) is an important industrial chemical used in fertilizers, detergents, and in the food industry. It is produced by two different methods. In the electric furnace method, elemental phosphorus (P4) is burned in air to form P4O10, which is then reacted with water to give H3PO4. In the wet process, the mineral phosphate rock [Ca5(PO4)3F] is reacted with sulfuric acid to give H3PO4 (and HF and CaSO4). (a) Write the balanced equations for the electric furnace method. Include the phase abbreviations.
Answer:
P₄(s) + 5 O₂(g) ⇒ P₄O₁₀(s)
P₄O₁₀(s) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)
P₄(s) + 5 O₂(g) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)
Explanation:
The electric furnace method for the synthesis of phosphoric acid has 2 steps. In the first step, elemental phosphorus (P₄) is burned in air to form P₄O₁₀. The balanced reaction is:
P₄(s) + 5 O₂(g) ⇒ P₄O₁₀(s)
In the second step, P₄O₁₀ reacts with water to give phosphoric acid.
P₄O₁₀(s) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)
If we add both steps, we get the global reaction.
P₄(s) + 5 O₂(g) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)
The model illustrates a process by which a substance is taken up by a cell.
Which statements describe the process?
A. The model shows the process of endocytosis.
B. The process shown in the model requires energy from the cell.
C. The cell membrane in the model remains intact throughout the process.
D. The model shows the process of facilitated diffusion.
Answer:
A
Explanation:
I took intro to biotechnology
The chemical name for laughing gas is dinitrogen oxide. The two elements found in a sample of this gas are and .
Answer:
Nitrogen and Oxygen
Explanation:
Nitrous oxide, commonly known as laughing gas or nitrous, is a chemical compound, an oxide of nitrogen with the formula N2O.
Do Some vertebrates' offspring develop inside the mothers body.
Answer: Some reptiles, amphibians , fish and invertebrates carry their developing young inside them.
Explanation: Some of them :)
What is the correct definition of speed?
A. time per distance (hours per mile or seconds per meter)
B.distante per time (miles per hour or meters per second)
C.time (hours or seconds
D.distance (miles or meters)
Answer:
B
Explanation:
Identify the following atoms using their symbols:
a. contains 20 protons.
b. contains 12 electrons.
c. has atomic number = 30.
d. the fifth-period transition metal with properties similar to copper.
e. the group VA metalloid in the fifth period.
f. the lightest metallic element in group IVA.
g. the fourth-period element with properties similar to oxygen.
h. the metalloid in the second period.
i. the element with the fewest number of electrons in the sixth period.
j. the third-period element with the largest number of electrons.
Answer:
B.
Explanation:
just did it
Arrange the following elements in order of decreasing electronegativity:
Strontium, Magnesium, Barium, Beryllium, Radium and Calcium.
Answer:
Be,Mg,Ca,Sr,Ba.Ra[down the group electronegativity is decreasing]
Explanation:
The following elements in order of decreasing electronegativity are:
Beryllium > Magnesium > Calcium > Strontium > Barium > Radium.
Which is the correct order for decreasing the strength of electronegativity?Electronegativities decrease from top to bottom within a group of elements. The order of decreasing electronegativities F > Cl > Br > I is another sequence that we will use to interpret the chemical and physical properties of organic compounds.
What is the order of decreasing atomic radius?
In the periodic table, atomic radii decrease from left to right across a row and increase from top to bottom down a column. Because of these two trends, the largest atoms are found in the lower-left corner of the periodic table, and the smallest are found in the upper right corner.
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The air pressure inside a balloon is 0.78 atm. What is this
pressure in mmHg?
mmHg
Your answer should be rounded to 2 significant figures. Do not include units in
Answer:
The pressure in mmHg is 59.
Explanation:
Given data:
Pressure of air inside balloon = 0.78 atm
Pressure in mmHg = ?
Solution:
mmHg:
mmHg is referred as manometric unit of pressure. It is define as the pressure exerted by mercury column at height of one millimeter.
Symbol:
"mmHg"
Atmosphere (atm)
atm is unit of pressure. It is used as a standard unit. It is equal to the 101325 Pa.
1 atm = 760 mmHg
Inorder to convert the atm into mmHg we will multiply the given atm value with 760.
0.78 atm × 760 mmHg / 1 atm = 592.8 mmHg
59 mmHg or 59
What is an atomic mass of an element that has 26 neutrons 24 protons and 23 electrons
Answer:
50
Explanation:
atomic mass of an element is the sum of protons and neutrons as electro is negligible in weight.
Which activity removes a large amount of alcohol from the body
Which activity removes a large amount of alcohol from the body? After alcohol has been consumed and reaches the bloodstream, up to 10% of the alcohol is disposed of through the urine, and 80% to 90% by oxidation in the liver. The average drinker eliminates about 2/3 of a standard drink unit (a shot) per hour.
Which reaction is balanced correctly?
C 6H 12O6 + 3O 2 → 6CO 2 + 6H 2O
CH 4 + 4O 2 → CO 2 + 2H 2O C
3H 8 + 5O 2 → 3CO 2 + 4H 2O
C + O 2 → 2CO 2
C3H8 + 5O2 → 3CO2 + 4H2O .
This reaction is balanced correctly because number of atoms on reactant side and product side are same.
Which of the following statements is true about the sense of smell? Men and women smell the same number of odors. The amount of odors one can smell is unknown. Women tend to smell more odors than men. People can smell approximately 100 odors.
Answer:
the answer is C.) Women tend to smell more odors than men.
Explanation:
The statements is true about the sense of smell is women tend to smell more odors than men.
What is sense?Sense is defined as a biological system utilized by an organism for sensation, which is the process of acquiring information about the environment and responding to stimuli.
Sense organ is defined as a physiological part that is altered by a stimulus in such a way that it causes activation of associated sensory nerve fibers, which transmit specific impulses to the central nervous system, where they are processed as corresponding sensations.
It can also be defined as a portion of the body that allows you to feel the physical features of a scenario.
Ears, eyes, nose, tongue, skin are the five important sense organs of our body.
Thus, the statements is true about the sense of smell is women tend to smell more odors than men.
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Match the assumption with the correct unit of concentration.
1- Molarity
2- Molality
3- mass %
4- mole fraction
5- parts per a million(ppm)
A. 1 kg of solution
B. 1 g of solute
C. 100 g of solute
D. 1 mole solute
E. 1L of solute
F. 100 g of solution
G. 1 mole of solvent
H. 1L of solvent
I. 1 mole of solution
J. 1 kg of solvent
K. 1 g of solution
L. 1L of solution
M. 1 kg of solute
Answer:
1. D/E
2. D/J
3. B/F
4. D or G/I
5. A
Explanation:
This is about sort of concentrations:
1- Molarity
Moles of solute in 1 L of solution
(we can also say, mmoles of solute in 1 mL)
2- Molality
Moles of solute in 1kg of solvent
3. mass %
grams of solute in 100g of solution
4. mole fraction
moles of solute or solvent per moles of solution
5. ppm
mg of solute in 1kg of solution
(we can also say μg of solute in 1 g of solution, or mg solute in 1L of solution)
What does the number on the bottom left of the symbol show?
Answer:
How many protons the elements has.
Explanation:
It is the atomic number, and that is the number of protons that an element has.
Answer:
The number at the bottom left shows the atomic number of the element. It’s the number of protons in the nucleus.
Explanation:
Rewrite the sentence, marana eats salad for lunch yesterday
Calculate the frequency of red light that has a wavelength of 700 nm.
1pt The step by step method scientists use to solve problems and test ideas is
O A. The Scientific Method
B. The Report
c. The Research
O D. Learning Objectives
A metallic material that is made by uniformly mixing copper with zinc to form bronze.
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