No. of Elements in a Period

Q.

The first period has_____elements and was called as_____period in modern periodic table.

Q.

Which of the given elements A, B, C, D and E with atomic number $2,3,7,10\mathrm{and}30$ respectively belong to the same period?

1. A, B, C

2. B, C, D

3. A, D, E

4. B, D, E

Q.

Name the first and last element in period $2$ of the modern periodic table.

Q.

Name the first and last element in period 2.

Q. All elements of period 7 are radioactive.

1. True
2. False

Q. The long periods of the periodic table are

1. Period 7
2. Period 4
3. Period 3
4. Period 5

Q. Which period is known as the very short period in the periodic table?

1. Period 1
2. Period 2
3. Period 3
4. Period 4

Q. Which are the short periods of the modern periodic table?

1. Period 2
2. Period 7
3. Period 3
4. Period 1