Oxidation States of First Transition Series

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Questions and Answers

Which element shows six different oxidation states due to its 5 unpaired d electrons?

Vanadium
Manganese (correct)
Scandium
Titanium

What happens when transition elements lose one 4s electron?

Formation of M ion (correct)
Formation of M^{4+} ion
Formation of M² ion
Formation of M^{3^{+}} ion

What trend is observed in the atomic radii of the elements of the transition series from left to right?

Decrease gradually (correct)
Increase gradually
Remain constant
Fluctuate irregularly

What happens as the number of unpaired electrons in 3d orbitals increases?

The number of oxidation states shown by the element also increases (B) Signup and view all the answers

Why do d electrons offer smaller screening effect compared to other electrons?

$n-1$d subshell is less penetrating or more diffused (A) Signup and view all the answers

What happens to the oxidation states of transition elements as the number of unpaired electrons in 3d orbitals increases?

The number of oxidation states shown by the element also increases (D) Signup and view all the answers

What happens to the atomic radii of transition elements as we move across a transition series from left to right?

The atomic radii decrease gradually (D) Signup and view all the answers

Which element in the first transition series shows oxidation states from -2 to +7?

Manganese (C) Signup and view all the answers

What happens when a transition element loses two 4s electrons?

$M^{2+}$ ion is formed (C) Signup and view all the answers

Why do d electrons offer smaller screening effect compared to other electrons?

D orbitals in an atom are less penetrating or more diffused (C) Signup and view all the answers

Match the following oxidation states with their corresponding electron loss:

Loss of one 4s electron = M² ion Loss of two 4s electrons = M^{3^{+}} ion Loss of unpaired 3d and 4s electrons = M ion Signup and view all the answers

Match the following elements with the number of oxidation states they show:

Scandium = Only one unpaired electron Manganese = -2 to +7 oxidation states Signup and view all the answers

Match the following trends with the atomic radii of d block elements:

Atomic radii decrease gradually from left to right = Trend in atomic radii Nuclear charge increases from left to right = Trend in atomic radii D orbitals offer smaller screening effect = Trend in atomic radii D electrons enter a penultimate (n-1)d subshell = Trend in atomic radii Signup and view all the answers

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