Use the periodic table to choose the element that matches each description. halogen: group iia: nonreactive: alkali metal:

Halogen,  group IIA, nonreactive, and alkali metal are found in 17th, 2nd, 18th, and 1st column respectively.

Periodic Table:

The elements are arranged according to their atomic number. The elements with similar properties are arranged in groups.

Halogen:

Group 2A:

Nonreactive:

Alkali metal:

Hence we can conclude that halogen,  group IIA, nonreactive, and alkali metal are found in 17th, 2nd, 18th, and 1st column respectively.

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.