Question

Complete the following table for atoms or ions:

Short answer

Atom or Ion	Number of protons	Number of Electron	Electrons loss/ Gained
${\mathrm{K}}^{+}$	${19}^{+}$p	$18e^{-}$	$1e^{-}$ lost
${\mathrm{Mg}}^{2+}$	${12}^{+}$p	$10e^{-}$	$2e^{-}$lost
$O^{2-}$	$8^{+}$p	$10e^{-}$	$2e^{-}$gained
${\mathrm{Al}}^{3+}$	${13}^{+}$p	$10e^{-}$	$3e^{-}$lost

Step-by-step solution

Given Information

We need to complete the table.

Simplify

Atom or Ion	Number of Protons	Number of Electrons	Electrons Lost/Gained
${\mathrm{K}}^{+}$	${19}^{+}$p	$18e^{-}$	$1e^{-}$lost
${\mathrm{Mg}}^{2+}$	${12}^{+}$p	$10e^{-}$	$2e^{-}$lost
${\mathrm{O}}^{2-}$	$8^{+}$p	$10e^{-}$	$2e^{-}$ gained
${\mathrm{Al}}^{3+}$	${13}^{+}$p	$10e^{-}$	$3e^{-}$lost