Question

which pair of atomic number represents S- block elements ? options are (1) 7,15 (2)6,12 (3) 9,17 (4) 3,12

Answer 1

Heya...
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QUESTION
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Which pair of atomic number represents S-block elements

ANSWER
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(2). 6,12 is correct

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Answer 2

Answer: The correct answer is Option 4.

Explanation:

S-block elements are defined as the elements whose last electron enters s-sub shell. The general electronic configuration of these elements is $ns^{1-2}$

Group 1 and Group 2 elements are known as s-block elements.

Elements belonging to s-block are:  Hydrogen (1), Lithium (3), Beryllium (4), Sodium (11), Magnesium (12), Potassium (19), Calcium (20), Rubidium(37), Strontium (38), Cesium (55), Barium (56), Francium (87) and Radium (88)

The atomic numbers belonging to s-block elements is 3, 12

Hence, the correct answer is Option 4.