Question

Use the periodic table to answer the following questions.
(a) Identify an element with five electrons in the outer subshell.
(b) Identify an element that would tend to lose two electrons.
(c) Identify and element that would tend to gain two electrons.
(d) Identify the group having metal non-metal liquid as well as gas at the room
temperature.

Answer 1

(a) Chromium (Z=24) contains five electrons in 3d subshell.
(b) Magnesium (Z=12), an alkaline earth metal, can readily lose two electrons to form $M{g}^{2+}$.
(c) Oxygen (Z=8) gains 2 electrons to form $O^{2-}$.
(d) Halogens (goup 17) contains metal (iodine), non metals (F,Cl and Br), liquid bromine and gases.