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07/10/2021 4:16 pm
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(a) What is meant by (i) a group, and (ii) a period, in a periodic table?
(b) How many periods and groups are there in the long form of periodic table?
(c) Give two examples each of (i) group 1 elements (ii) group 17 elements (iii) group 18 elements.
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07/10/2021 4:18 pm
(a) (i) The vertical columns in a periodic table are called groups.
(ii) The horizontal rows of elements in a periodic table are called periods.
(b) There are seven periods and eighteen groups in the long form of periodic table.
(c) (i) Group 1: Lithium and Sodium.
(ii) Group 17: Fluorine and Chlorine.
(iii) Group 18: Neon and Argon.