Characteristic properties recur at definite intervals in the modern periodic table because elements with similar valence shell configurations (and thus similar properties) appear periodically as you move through increasing atomic numbers.

Characteristic properties recur at definite intervals in the modern periodic table because elements with similar valence shell configurations (and thus similar properties) appear periodically as you move through increasing atomic numbers.
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X | Y |
---|---|
1: Element with atomic number 19 | A: Group 18 [0 group] |
2: Element with electronic configuration 2 | B: Group 16 [VI A] |
3: Element with a valency of -2 | C: Group 1 [IA] |
4: Element ‘P’ which loses 3 electrons to form a cation | D: Group 17 [VII A] |
5: Element ‘Q’ in period-3 which has the highest electron affinity | E: Group 13 [III A] |