Question

An atom of an alkaline earth metal reacts with another element to form a compound. Which element MOSTLY LIKELY combined with the alkaline metal?
A) iron
B) neon
C) oxygen
D) sodium

Answer 1

Answer: oxygen

Explanation:

An ionic compound is formed when one element completely transfers its valence electron to another element.

The element which donates the electron is known as electropositive element and forms a positively charged ion called as cation. The element which accepts the electrons is known as electronegative element and forms a negatively charged ion called as anion.

As alkaline earth metal can lose two electrons, it will combine with an element which can gain electrons.

$O:8:1s^22s^22p^4$

$O^{2-}:10:1s^22s^22p^6$

Thus alkaline earth metal MOSTLY LIKELY combine with oxygen.

Answer 2

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