Question

In the modern periodic table, the elements present in groups are called s-block elements.

• A. 1 and 2
• B. 2 and 4
• C. 4 and 5
• D. 6 and 7

Answer 1

The correct option is A 1 and 2

In the modern periodic table, the elements are classified into s, p, d and f blocks based on the subshell in which the last electron enters. In group 1 and 2, the last electron of the elements enter in their outermost s-subshell. Therefore, these elements are called s-block elements.