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Question

If the atomic number of an element is 19, in which group of the modern periodic table is the element placed?

(a) Group 1

(b) Group 2

(c) Group 18

(d) Group 9

Periodic Table

Answer

(a) Group 1

Explanation

An element with atomic number 19 is Potassium (K).

Electronic configuration of potassium: 2, 8, 8, 1

Since it has one electron in its outermost shell, it belongs to Group 1 (Alkali Metals) of the modern periodic table.

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