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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 an element that would tend to gain two electrons. (d) Identify the group having metal, non-metal, liquid, as well as gas at room temperature.

Solution:

(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 Mg2+ (c) Oxygen (Z=8) gains 2 electrons to form O2− (d) Halogens (group 17) contains metal (iodine), non-metals (F, Cl, and Br), liquid bromine and gases.