Interpretation:
The group which is composed entirely of non-metals needs to be determined.
Concept introduction:
The modern periodic table consists of vertical rows, which are called as groups and horizontal rows, which are called as periods. There are 7 periods and 18 groups in the periodic table. There are four blocks in the periodic table, s-block, p-block, d-block and f-block.

Answer to Problem 9STP
Correct option is D. Group 18 consists of only non-metals.
Explanation of Solution
Reason for correct option:
Non-metals are found in p-block of the periodic table, that is, from group 13 to group 18. But metalloids are also found in this block along with non-metals. Metalloids have properties of metals and non-metals and found in group 13 to 17. So, group 18 consists of non-metals only. So, correct option is D.
Reason for incorrect option: Group 1 consists of alkali metals. So, A is incorrect option.
Group 13 consists of one metalloid, Boron along with the non-metals. So, B is incorrect option.
Group 15 consists of one metalloid, Arsenic along with the non-metals. So, C is incorrect option.
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