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.

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.

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