Question 1

Which of the following species is isoelectronic with As^3-? A)Na⁺ B)Cl ^- C)Ar D)Kr E)Ba²⁺

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Question 2

Which of the following has the largest atomic radius? A)S² ^- B)Cl C)Cl ^- D)K⁺ E)S

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Question 3

Which of the following species is isoelectronic with Kr? A)K⁺ B)Cl ^- C)Ar D)Xe E)Sr²⁺

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Question 4

Which of the following has the smallest atomic radius?
A)Cl
B)P
C)S
D)Si
E)Al

Accepted Answer

Atomic radius decreases across a period from left to right on the periodic table. As chlorine (Cl) is on the right side of the periodic table, it has the smallest atomic radius among the given options.

Question 5

Which of the following has the largest atomic radius? A)F B)O C)N D)C E)B

Accepted Answer

Atomic radius increases down a group and decreases across a period on the periodic table. Among the given options, B (Boron) is the element farthest down and to the left, indicating it has the largest atomic radius.

Question 6

Which of the following is likely to form ions two units lower in charge than expected from the group number?
A)Tl
B)Hg
C)Zn
D)Se
E)Cd

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Question 7

Which of the following species is isoelectronic with Ra²⁺? A)I^- B)Kr C)Xe D)Rn E)Fr

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Question 8

Which of the following atoms or ions is isoelectronic with Be²⁺? A)Na⁺ B)Br ^- C)He D)Xe E)He⁺

Accepted Answer

Isoelectronic species have the same number of electrons. Be²⁺ has a total of 16 electrons. He, which has two electrons, is the only option with the same number of electrons as Be²⁺. The other options have different numbers of electrons.

Question 9

Write the ground-state electron configuration of Fe³⁺. A)[Ar]3d⁵4s² B)[Ar]3d³4s² C)[Ar]3d³4s⁰ D)[Ar]3d⁶4s¹ E)[Ar]3d³4s³

Accepted Answer

Starting with Fe, we know it has 26 electrons. The electron configuration for Fe is [Ar] 4s2 3d6. The electron configuration for S is [Ne] 3s2 3p4. The electron configuration for P is [Ne] 3s2 3p3. The electron configuration for +S is [Ne] 3s2 3p3. Therefore, the ground-state electron configuration of Fe³⁺ is: [Ar] 3d10 4s2 3p6 + [Ne] 3s2 3p3 + [Ne] 3s2 3p3 + [Ne] 3s2 3p0 Which simplifies to: [Ar] 3d10 4s2 3p6 3s2 3p3 3s2 3p0 or written out with the shorthand notation: [Ar]3d³4s². The only option that matches this electron configuration is B.

Question 10

Of the following,which has the largest atomic radius? A)Ga B)Ge C)As D)Se E)Br

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Question 11

Which of the following species is isoelectronic with S² ^- ? A)Mg²⁺ B)Rb⁺ C)Ar D)As³ ^- E)Br ^-

Accepted Answer

Isoelectronic species have the same number of electrons. Counting the electrons in the given species, we get a total of 34 electrons. Among the given options, only Ar has 18 electrons in its neutral state, but when we add an extra electron to form Ar-, it becomes isoelectronic with the given species with 34 electrons.

Question 12

What is the ground-state electron configuration of Rb⁺? A)[Kr] B)[Kr]5s¹ C)[Ar] D)[Ar]4s¹ E)[Kr]4d¹⁰

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Question 13

For F^-,write the ground-state electron configuration. A)[Ne]2p⁵ B)[Ne] C)[Ar] D)[He]2p⁵ E)[He]1s²

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Question 14

All the following can have the ground-state electron configuration [Xe]4f¹⁴5d¹⁰ except A)Pb⁴⁺. B)Hg²⁺. C)Bi⁵⁺. D)Tl⁺. E)Au⁺.

Accepted Answer

The electron configuration [Xe]4f¹⁴5d¹⁰ belongs to the element Tl (thallium). The other options in the answer choices have the same electron configuration, but they are not correct because they do not correspond to the electron configuration of any stable element. Tl⁺., on the other hand, corresponds to the stable ion of thallium, which has lost one electron from the outermost p sub-level.

Question 15

From the data below,which elements are likely to be nonmetals? Element First ionization energy,kJ.mol ^- ¹ ^--------^{------------------} 1 1310 2 980 3 418 4 2080 5 947 A)3 and 5 B)3 only C)1 and 4 D)1 and 2 E)2 and 5

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Question 16

What is the ground-state electron configuration of Nb? A)[Kr]4d⁴5s¹ B)[Kr]4d⁵5s² C)[Kr]5d³4s² D)[Kr]5d³5s² E)[Kr]4d³5s²

Accepted Answer

The correct electron configuration for niobium (Nb) is [Kr] 4d^4 5s^1, which is closest to the format given in option E when corrected for typographical errors. The actual configuration should read as [Kr] 4d^4 5s^1, indicating that after the [Kr] core, niobium has four electrons in the 4d orbital and one electron in the 5s orbital.

Question 17

Write the ground-state electron configuration of Cl⁺. A)[Ne]3s²3p⁴ B)[Ne]3s²3p⁵ C)[Ne]3s¹3p⁴ D)[Ne]3s²3p⁶ E)[Ar]3s²3p⁴

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Question 18

From the data below,which element is likely to be a metal? Element First ionization energy,kJ.mol ^- ¹ ^{--------------------------} 1 1310 2 1011 3 418 4 2080 5 947 A)2 B)5 C)3 D)1 E)4

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Question 19

All the following can have the ground-state electron configuration [Kr]4d¹⁰ except A)Cd²⁺. B)Ag⁺. C)Pd. D)In⁺. E)Sn⁴⁺.

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Question 20

Si⁴⁺ is isoelectronic with which of the following? A)K⁺ B)Ne C)Kr D)Cl^- E)Sr²⁺

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Quiz 2: Quantum Mechanics in Action: Atoms

Which of the following species is isoelectronic with As3-?

Which of the following has the largest atomic radius?

Which of the following species is isoelectronic with Kr?

Which of the following has the smallest atomic radius?

Which of the following has the largest atomic radius?

Which of the following is likely to form ions two units lower in charge than expected from the group number?

Which of the following species is isoelectronic with Ra2+?

Which of the following atoms or ions is isoelectronic with Be2+?

Write the ground-state electron configuration of Fe3+.

Of the following,which has the largest atomic radius?

Which of the following species is isoelectronic with S2 - ?

What is the ground-state electron configuration of Rb+?

For F-,write the ground-state electron configuration.

All the following can have the ground-state electron configuration [Xe]4f145d10 except

From the data below,which elements are likely to be nonmetals? Element First ionization energy,kJ.mol - 1 -------------------------- 1 1310 2 980 3 418 4 2080 5 947

What is the ground-state electron configuration of Nb?

Write the ground-state electron configuration of Cl+.

From the data below,which element is likely to be a metal? Element First ionization energy,kJ.mol - 1 -------------------------- 1 1310 2 1011 3 418 4 2080 5 947

All the following can have the ground-state electron configuration [Kr]4d10 except

Si4+ is isoelectronic with which of the following?

Which of the following species is isoelectronic with As^3-?

Which of the following species is isoelectronic with Ra²⁺?

Which of the following atoms or ions is isoelectronic with Be²⁺?

Write the ground-state electron configuration of Fe³⁺.

Which of the following species is isoelectronic with S² ^- ?

What is the ground-state electron configuration of Rb⁺?

For F^-,write the ground-state electron configuration.

All the following can have the ground-state electron configuration [Xe]4f¹⁴5d¹⁰ except

From the data below,which elements are likely to be nonmetals? Element First ionization energy,kJ.mol ^- ¹ ^--------^{------------------} 1 1310 2 980 3 418 4 2080 5 947

Write the ground-state electron configuration of Cl⁺.

From the data below,which element is likely to be a metal? Element First ionization energy,kJ.mol ^- ¹ ^{--------------------------} 1 1310 2 1011 3 418 4 2080 5 947

All the following can have the ground-state electron configuration [Kr]4d¹⁰ except

Si⁴⁺ is isoelectronic with which of the following?