Number of Elements in a Period

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

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

Q. All elements of period 7 are radioactive.

1. True
2. False

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

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

Q. The long periods of the periodic table are

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

Q. Four elements are the most abundant in life: carbon, oxygen, hydrogen, and nitrogen. What do they have in common?

1. They can all form double bonds with carbon.
2. They are all relatively light atoms (near the top of the periodic table).
3. They have the same atomic mass.
4. They are all tetravalent.