Question

How does calcium obey the octet rule when reacting to form compounds?. A. It gains electrons. B. It does not change its number of electrons. C. It gives up electrons. D. It fills its valence level. E. It shares electrons.

Answer 1

Ca belongs to group 2 in the periodic table.

the electronic configuration of Ca is - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Ca has 2 valence electrons in its outermost shell. Octet rule is when the outermost shell of the atom is complete with 8 electrons, that means both s and p subshells are complete.

for Ca to obey the octet rule its outermost shell should have 8 electrons.

therefore Ca should give up the 2 electrons in its outermost shell.

then the 3rd energy shell is the outermost shell with 8 electrons.

the correct answer is C. It gives up electrons.

Answer 2

Answer:

C. It gives up electrons.