Question

Which of the following traits characterizes the alkali metals? A) very high melting point B) the lowest first ionization energies in a period C) the smallest atomic radius in a period D) formation of dianions

Answer 1

Answer:

$\boxed{\text{Answer: B) The lowest first ionization energies in a period.}}$

Alkali metals have the lowest ionization energy in each period and this is because they are having the largest atomic size in their respective period. The valence electron in large size atoms are held loosely by the nucleus and can be lost easily. Furthermore, IP is the amount of energy required in order to release an electron from the outermost orbit of an isolated gaseous atom.

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