Question

Statement 1: Lithium belongs to group 1 of the periodic table.​
Statement 2: Lithium and beryllium belong to the same period.​

• A. Both statements are incorrect.​
• B. Both statements are correct.
• C. Only statement 1 is correct.​
• D. Only statement 2 is correct.

Answer 1

The correct option is B Both statements are correct.

Atomic number of Lithium = 3
Electronic configuration: 2, 1
Period number = no. of shells = 2
Group number = no. of valence electrons = 1
So, statement 1 is correct.

Atomic number of Beryllium = 4
Electronic configuration: 2, 2
Period number= no. of shells = 2
Thus, Lithium and Beryllium belong to the 2nd period.
So, statement 2 is also correct.

Therfore, both statements are correct.