QQuestion
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
✓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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