Question 1

Which of the following species has the ground-state electron configuration [Ar]3d⁴? A)Ti B)V²⁺ C)Cr²⁺ D)Fe²⁺

Accepted Answer

The electron configuration given indicates that the atom has 24 electrons, with the [Ar] core of 18 electrons and the remaining 6 electrons in the 3d, 4s, and 4p orbitals. The superscripts indicate the number of electrons in each orbital, so we have:

- 3d: 1 electron
- 4s: 1 electron
- 4p: 4 electrons

The only choice that fits this configuration is C, which corresponds to chromium (Cr). The other choices either have too many or too few electrons in the relevant orbitals, or have electronic configurations that are completely different.

Question 2

Which transition metal has the anomalous ground-state electron configuration: [Kr] 4d^10? A)Rh B)Pd C)Ag D)Cd

Accepted Answer

The electron configuration given belongs to Pd (Palladium) which is the only transition metal with this anomalous ground-state electron configuration. The [Kr] 4d^10 configuration is expected for most transition metals in group 10, but Pd has one electron in the 4d subshell and one electron in the 5s subshell, resulting in the anomalous configuration of [Kr] 4d^10 5s^1.

Question 3

What is the ground-state electron configuration for the element chromium (Z = 24)? A)[Ne] 4s² 3d⁴ B)[Ar] 4s² 3d⁴ C)[Ar] 4s¹ 3d⁵ D)[Ar] 3d⁶

Accepted Answer

Chromium has a total of 24 electrons. The electron configuration of the element Chromium can be determined by using the Aufbau principle and Hund's rule. The Aufbau principle states that electrons occupy the lowest energy level first, while Hund's rule states that each orbital in a subshell must be occupied by one electron before a second electron is added to any orbital. The electron configuration for Chromium would be [Ar] 4s1 3d5. However, Chromium is an exception to this, and one of the electrons from the 4s orbital jumps up to the 3d orbital, creating a half-filled d subshell, which is more stable. Thus, the ground-state electron configuration of Chromium is [Ar] 4s1 3d5, which can be represented as [Ar] 4s1U1P11S1P03d1U1P5S1P0 or simplified to [Ar] 4s1U1P11S1P03d5. Choice C is the only option that has the correct configuration for Chromium.

Question 4

What is the ground-state electron configuration for Co²⁺ (Z = 27)? A)[Ar] 4s² 3d⁹ B)[Ar] 4s² 3d⁵ C)[Ar] 3d⁷ D)[Ar] 4s¹ 3d⁶

Accepted Answer

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Question 5

What is the d orbital-filling diagram for Fe³⁺ (Z = 26)? A)(A) B)(B) C)(C) D)(D)

Accepted Answer

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Question 6

Which first row transition element has the highest melting point?
A)Sc
B)V
C)Fe
D)Zn

Accepted Answer

Vanadium (V) has the highest melting point among the given options. Transition metals typically have high melting points due to the strong metallic bonding facilitated by the delocalization of d electrons. Among Sc, V, Fe, and Zn, vanadium exhibits a particularly strong metallic bond due to its electron configuration, contributing to its high melting point.

Question 7

Which of the following elements is an inner transition metal?
A)Eu
B)Fe
C)Ru
D)Sc

Accepted Answer

Eu (europium) is an inner transition metal because it is located in the f-block of the periodic table. Fe (iron), Ru (ruthenium), and Sc (scandium) are transition metals but not inner transition metals.

Question 8

Which element is most likely to have an anomalous electron configuration?
A)Y
B)Tc
C)Ag
D)Cd

Accepted Answer

Silver (Ag) is known to have an anomalous electron configuration due to the stability provided by a filled or half-filled d subshell, resulting in a configuration of [Kr] 4d^10 5s^1 instead of the expected [Kr] 4d^9 5s^2.

Question 9

What is the characteristic outer electron configuration for transition elements? A)(n - 1)d^10-x^ns² B)(n)d^10-x^ns² C)(n + 1)d^10-x^ns¹ D)(n - 1)d^10-x(n + 1)s²

Accepted Answer

The characteristic outer electron configuration for transition elements is (n-1)d1-10ns1-2. Option A matches this pattern, as it shows the (n-1)d orbitals filling first and then the ns orbitals filling next for certain elements. Options B and C do not show the (n-1)d orbitals filling, and option D incorrectly shows the (n+1)s orbital filling before the (n-1)d orbitals.

Question 10

How many d electrons are there in MnO₄^-? A)0 B)1 C)2 D)3

Accepted Answer

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Question 11

What is the ground-state electron configuration for the element cobalt (Z = 27)? A)[Ar] 4s² 3d⁷ B)[Ar] 3d⁹ C)[Ar] 4s² 4p⁶ 5s¹ D)[Ar] 3d⁷

Accepted Answer

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Question 12

In which blocks of the periodic table are the transition series and inner transition series elements found?
A)d,p
B)d,f
C)s,d
D)s,p

Accepted Answer

The transition series and inner transition series elements are found in the d and f blocks of the periodic table, respectively.

Question 13

What is the ground-state electron configuration for Cr in Cr₂O₇^2-? A)[Ar] 4s¹ 3d⁵ B)[Ar] 4s² 3d⁶ C)[Ar] 3d⁴ D)[Ar] 3d⁰

Accepted Answer

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Question 14

Element M has the valence electron configuration 3d⁶ 4s².What is the valence electron configuration of The M³⁺ ion? A)3d⁵ B)3d³ 4s² C)3d⁴ 4s¹ D)3d⁹ 4s²

Accepted Answer

To determine the valence electron configuration of the M³⁺ ion, we simply remove one electron from the valence shell of the neutral M atom. The valence electron configuration of the neutral M atom is: 3d⁶ 4s² Removing one electron from the 3d orbital gives us: 3d⁵ Thus, the valence electron configuration of the M³⁺ ion is: 3d⁵, which is choice A.

Question 15

Which is a third transition series element?
A)Al
B)Mg
C)Pr
D)Pt

Accepted Answer

Pt (platinum) is the only element in the options given that belongs to the third transition series, which is defined as the series that follows the second transition series and includes elements with partially filled d orbitals in their atomic electronic structure. Al (aluminum) and Mg (magnesium) are both elements in the third period of the periodic table but belong to the s-block, not the d-block transition metals. Pr (praseodymium) is a lanthanide element, not a transition metal.

Question 16

The number of transition series is
A)one
B)two
C)four
D)seven

Accepted Answer

There are four transition series: 
1) 3d series (Sc-Zn) 
2) 4d series (Y-Cd) 
3) 5d series (La-Hg) 
4) 6d series (Ac-No).

Question 17

How many valence electrons does the element Co have?
A)2
B)7
C)8
D)9

Accepted Answer

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Question 18

Which transition element has the highest melting point?
A)Fe
B)V
C)Mo
D)W

Accepted Answer

Tungsten (W) has the highest melting point (3422°C) of all the transition elements. Therefore, choice D is the correct answer.

Question 19

Transition series elements are all
A)gases.
B)metals.
C)nonmetals.
D)semimetals.

Accepted Answer

Transition series elements are all metals.

Question 20

What two transition elements have the highest electrical conductivity of any elements at room temperature?
A)copper and iron
B)copper and silver
C)iron and chromium
D)silver and gold

Accepted Answer

Copper and silver are both transition metals that have the highest electrical conductivity of any elements at room temperature. They are commonly used in electrical wiring because of their high conductivity properties. Iron, chromium, silver, and gold also have high conductivity but not as high as copper and silver.

Quiz 20: Transition Elements and Coordination Chemistry

Which of the following species has the ground-state electron configuration [Ar]3d⁴?

Which transition metal has the anomalous ground-state electron configuration: [Kr] 4d^10?

What is the ground-state electron configuration for the element chromium (Z = 24) ?

What is the ground-state electron configuration for Co²⁺ (Z = 27) ?

What is the d orbital-filling diagram for Fe³⁺ (Z = 26) ?

Which first row transition element has the highest melting point?

Which of the following elements is an inner transition metal?

Which element is most likely to have an anomalous electron configuration?

What is the characteristic outer electron configuration for transition elements?

How many d electrons are there in MnO₄^-?

What is the ground-state electron configuration for the element cobalt (Z = 27) ?

In which blocks of the periodic table are the transition series and inner transition series elements found?

What is the ground-state electron configuration for Cr in Cr₂O₇^2-?

Element M has the valence electron configuration 3d⁶ 4s².What is the valence electron configuration of The M³⁺ ion?

Which is a third transition series element?

The number of transition series is

How many valence electrons does the element Co have?

Which transition element has the highest melting point?

Transition series elements are all

What two transition elements have the highest electrical conductivity of any elements at room temperature?

Quiz 20: Transition Elements and Coordination Chemistry

Which of the following species has the ground-state electron configuration [Ar]3d4?

Which transition metal has the anomalous ground-state electron configuration: [Kr] 4d10?

What is the ground-state electron configuration for the element chromium (Z = 24) ?

What is the ground-state electron configuration for Co2+ (Z = 27) ?

What is the d orbital-filling diagram for Fe3+ (Z = 26) ?

Which first row transition element has the highest melting point?

Which of the following elements is an inner transition metal?

Which element is most likely to have an anomalous electron configuration?

What is the characteristic outer electron configuration for transition elements?

How many d electrons are there in MnO4-?

What is the ground-state electron configuration for the element cobalt (Z = 27) ?

In which blocks of the periodic table are the transition series and inner transition series elements found?

What is the ground-state electron configuration for Cr in Cr2O72-?

Element M has the valence electron configuration 3d6 4s2.What is the valence electron configuration of The M3+ ion?

Which is a third transition series element?

The number of transition series is

How many valence electrons does the element Co have?

Which transition element has the highest melting point?

Transition series elements are all

What two transition elements have the highest electrical conductivity of any elements at room temperature?

Which of the following species has the ground-state electron configuration [Ar]3d⁴?

Which transition metal has the anomalous ground-state electron configuration: [Kr] 4d^10?

What is the ground-state electron configuration for Co²⁺ (Z = 27) ?

What is the d orbital-filling diagram for Fe³⁺ (Z = 26) ?

How many d electrons are there in MnO₄^-?

What is the ground-state electron configuration for Cr in Cr₂O₇^2-?

Element M has the valence electron configuration 3d⁶ 4s².What is the valence electron configuration of The M³⁺ ion?