Question

Which of the following are the correct statements?
I) First period is the shortest and sixth period is the longest period.
II) 4th and 5th periods are short periods.
III) The incomplete period is seventh period.
IV) The long periods are 4th and 5th periods.

• A. I, III, and IV
• B. II and IV
• C. I and III
• D. I, II, III and IV

Answer 1

The correct option is A I, III, and IV

Please follow the description regarding period lengths,

1) as the 1st period accommodates only two elements it said to be shortest period.

2) as the 2nd and 3rd periods accommodate 8 electrons each they are said to be short periods.

3) as the 4th and 5th periods accommodate 18 electrons each they are said to be long periods.

4) as the 6th period accommodates 32 elements it is said to be longest period in the periodic table.

5) as the 7th period is incompletely filled it is said to be incompletely filled period.

According to these statements, 1, 3, 4 statements are correct it means the correct option is A.