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Xelga [282]
3 years ago
10

Select the false statement below concerning period 4 transition elements. A. The nickel atom has 18 inner/core electrons. B. Bot

h the chromium atom and the manganese atom have half-filled d subshells. C. The vanadium atom has fewer unpaired electrons than the nickel atom. D. The titanium atom has more unpaired electrons than the zinc atom. E. The iron atom has 8 valence electrons.
Chemistry
1 answer:
zepelin [54]3 years ago
7 0

Explanation:

Atomic number of nickel is 28 and its electronic distribution is 2, 8, 8, 2, 8. Therefore, in the inner/core electrons there are 18 electrons.

Atomic number of chromium is 24 and its electronic configuration is [Ar]4s^{1}3d^{5}. Whereas atomic number of manganese is 25 and its electronic configuration is [Ar]4s^{2}3d^{5}.

Hence, the statement both chromium atom and the manganese atom have half-filled d sub-shells, is true.

Atomic number of Vanadium is 23 and its electronic configuration is [Ar]4s^{2}3d^{3}. Atomic number of nickel is 28 and its electronic configuration is [Ar]4s^{2}3d^{8}.

So, there are three unpaired electrons in a Vanadium atom and in nickel atom there are 2 unpaired electrons.

Hence, the statement vanadium atom has fewer unpaired electrons than the nickel atom, is false.

Atomic number of titanium is 22 and its electronic configuration is [Ar]4s^{2}3d^{2}. Atomic number of zinc is 30 and its electronic configuration is [Ar]4s^{2}3d^{10}.

There are no unpaired electrons in a zinc atom. Hence, the statement titanium atom has more unpaired electrons than the zinc atom, is true.

Atomic number of iron is 26 and its electronic configuration is [Ar]4s^{2}3d^{6}. Since, 4s is the outermost shell so, in iron atom there are 2 valence electrons.

Hence, the statement iron atom has 8 valence electrons, is not true.

Thus, we can conclude that false statements below concerning period 4 transition elements are as follows.

  • The vanadium atom has fewer unpaired electrons than the nickel atom.
  • The iron atom has 8 valence electrons.
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