Question 1

Which of the following atoms will be diamagnetic?
A)Cr
B)Ru
C)Fe
D)Pt
E)Cd

Accepted Answer

Cd has a completely filled 4d subshell, making all of its electrons paired and therefore, diamagnetic. The other atoms listed have unpaired electrons and are paramagnetic.

Question 2

With the aid of a diagram,describe how the atomic radii of main group elements vary with position in the periodic table.

Accepted Answer

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Question 3

State Hund's rule,and show how it applies to the ground state of phosphorus atoms.

Accepted Answer

The answer of State Hund's rule,and show how it applies...

Question 4

Describe how the ionization energies of main group elements vary across a period in the periodic table,using a diagram if necessary.

Accepted Answer

The answer of Describe how the ionization energies of main...

Question 5

Select the paramagnetic ion. A)Cu⁺ B)Ag⁺ C)Fe³⁺ D)Cd²⁺ E)Ca²⁺

Accepted Answer

Paramagnetic ions have unpaired electrons, which contribute to their magnetic moment. In Fe³⁺, Fe has five unpaired electrons in its d-orbitals, making it the only paramagnetic ion among the choices.

Question 6

Write down the maximum number of electrons in an atom which can have a.quantum number n = 4. b.orbital designation 3d. c.orbital designation 2p_z.

Accepted Answer

The answer of Write down the maximum number of electrons...

Question 7

Select the diamagnetic ion. A)Cu²⁺ B)Ni²⁺ C)Cr³⁺ D)Sc³⁺ E)Cr²⁺

Accepted Answer

Diamagnetic ions have all electrons paired up and do not have any unpaired electrons. In Sc3+, all electrons are paired up in the d orbitals, making it a diamagnetic ion. A, B, C, and E ions have unpaired electrons in their d orbitals, making them paramagnetic ions.

Question 8

Write down the full electron configuration for ground state atoms of
a.element number 12.
b.element number 23.
c.element number 32.

Accepted Answer

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Question 9

Write down the full electron configuration for ground state atoms of
a.S (element 16).
b.Pd (element 46).

Accepted Answer

The answer of Write down the full electron configuration for...

Question 10

Which of the following elements will form a cation with a +2 charge?
A)Si
B)Sr
C)Ga
D)Cs
E)S

Accepted Answer

Sr belongs to group 2 of the periodic table and tends to lose two electrons to achieve a stable configuration, forming a cation with a +2 charge.

Question 11

Which of the following ions will be most likely to form when selenium ionizes? A)Se⁶⁺ B)Se⁴⁺ C)Se²⁺ D)Se^2- E)Se^4-

Accepted Answer

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Question 12

In Mendeleev's version of the periodic table,the elements were arranged in order of increasing atomic number.

Accepted Answer

Mendeleev's version of the periodic table was arranged in order of increasing atomic mass, with some exceptions made to fit elements into similar groups based on their chemical and physical properties. The modern periodic table is arranged in order of increasing atomic number.

Question 13

Briefly describe how the atomic radii and ionization energies of group 1A(1)elements compare with those of group 8A(18).Also,explain why the values of these properties are so different between these two groups.

Accepted Answer

The answer of Briefly describe how the atomic radii and...

Question 14

What is the correct order of decreasing size of the following ions? A)P^3- > Cl^- > K⁺ > Ca²⁺ B)Ca²⁺ > K⁺ > Cl^- > P^3- C)K⁺ > Cl^- > Ca²⁺ > P^3- D)K⁺ > Cl^- > P^3- > Ca²⁺ E)None of these is correct.

Accepted Answer

The size of ions generally decreases with increasing positive charge and increases with increasing negative charge. P^3- has the largest size due to its high negative charge, followed by Cl^-, K⁺, and Ca²⁺ with the smallest size due to its high positive charge.

Question 15

Define what is meant by ionization energy,and write a balanced chemical equation to represent the relevant process for element X.

Accepted Answer

The answer of Define what is meant by ionization energy,and...

Question 16

Which of the following elements is paramagnetic?
A)Kr
B)Zn
C)Sr
D)V
E)Ar

Accepted Answer

Paramagnetic elements are those that contain unpaired electrons in their electron configuration. Among the given options, only V (vanadium) has unpaired electrons in its 3d subshell, making it paramagnetic.

Question 17

Define what is meant by electron affinity,and write a balanced chemical equation to represent the relevant process for element Y.

Accepted Answer

The answer of Define what is meant by electron affinity,and...

Question 18

Select the most basic compound from the following. A)Bi₂O₃ B)SiO₂ C)Cs₂O D)Na₂O E)H₂O

Accepted Answer

Cs2O (Cesium oxide) is the most basic compound among the options because cesium is a highly electropositive element, making its oxide a strong base.

Question 19

In a single atom,write down the maximum possible number of electrons a.with n = 3. b.with the designation 4d_xy. c.with n = 5,l = 3,m_s = + .

Accepted Answer

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Question 20

Consider the set of isoelectronic atoms and ions A^2-,B^-,C,D⁺,and E²⁺.Which arrangement of relative radii is correct? A)A^2- > B^- > C > D⁺ > E²⁺ B)E²⁺ > D⁺ > C > B^- > A^2- C)A^2- > B^- > C < D⁺ < E²⁺ D)A^2- < B^- < C > D⁺ > E²⁺ E)None of these is correct.

Accepted Answer

Isoelectronic species have the same number of electrons, but they can have different numbers of protons, which determines their atomic radius. As the number of protons increases, the atomic radius decreases. Among the given set, we can see that A, B, and E all have the same number of electrons, but A has more protons than B and E. Similarly, D has fewer protons than C. Therefore, the order of increasing atomic radius is: A^2- > B^- > C > D⁺ > E²⁺. Hence, option A is correct.

Quiz 8: Electron Configuration and Chemical Periodicity

Which of the following atoms will be diamagnetic?

With the aid of a diagram,describe how the atomic radii of main group elements vary with position in the periodic table.

State Hund's rule,and show how it applies to the ground state of phosphorus atoms.

Describe how the ionization energies of main group elements vary across a period in the periodic table,using a diagram if necessary.

Select the paramagnetic ion.

Write down the maximum number of electrons in an atom which can have a.quantum number n = 4. b.orbital designation 3d. c.orbital designation 2pz.

Select the diamagnetic ion.

Write down the full electron configuration for ground state atoms of a.element number 12. b.element number 23. c.element number 32.

Write down the full electron configuration for ground state atoms of a.S (element 16). b.Pd (element 46).

Which of the following elements will form a cation with a +2 charge?

Which of the following ions will be most likely to form when selenium ionizes?

In Mendeleev's version of the periodic table,the elements were arranged in order of increasing atomic number.

Briefly describe how the atomic radii and ionization energies of group 1A(1)elements compare with those of group 8A(18).Also,explain why the values of these properties are so different between these two groups.

What is the correct order of decreasing size of the following ions?

Define what is meant by ionization energy,and write a balanced chemical equation to represent the relevant process for element X.

Which of the following elements is paramagnetic?

Define what is meant by electron affinity,and write a balanced chemical equation to represent the relevant process for element Y.

Select the most basic compound from the following.

In a single atom,write down the maximum possible number of electrons a.with n = 3. b.with the designation 4dxy. c.with n = 5,l = 3,ms = + .

Consider the set of isoelectronic atoms and ions A2-,B-,C,D+,and E2+.Which arrangement of relative radii is correct?

Write down the maximum number of electrons in an atom which can have a.quantum number n = 4. b.orbital designation 3d. c.orbital designation 2p_z.

In a single atom,write down the maximum possible number of electrons a.with n = 3. b.with the designation 4d_xy. c.with n = 5,l = 3,m_s = + .

Consider the set of isoelectronic atoms and ions A^2-,B^-,C,D⁺,and E²⁺.Which arrangement of relative radii is correct?