Question

assertion:- the elements sodium (Na), magnesium (Mg), aluminium (Al) belong to the same group in modern periodic table

reason:- atoms of different elements with same number of occupied shells are placed in same period.

Answer 1

Answer:

Assertion is false and Reason is true

Explanation:

assertion is false because the valence electrons of sodium, magnesium and aluminium are different and hence they are placed in different groups but in the question it is mentioned that they are in the same group therefore it is false.

reason is true as elements with the same number of shells are placed in the same period.