Question

1. Mendeleev's periodic table contain .......... periods.
(a) 7 (1) 8 (c) 12 (d) 10
2. The incomplete period in the periodic table is
(a) 7period (b) 6 period (c) 3 period (d) 1 period
3. The most reactive metal is..........
(a) Na (6) Cu (c) Fe (d) Ca
4. The only liquid metal is
(a) Molybdenum (6) Gold (c) Mercury (d) Bromine​

Answer 1

Answer:

118 Elements and Their Symbols and Atomic Numbers

Name of the Element Symbol of the Element Atomic Number

Carbon C 6

Nitrogen N 7

Oxygen O 8

Fluorine F 9

Answer 2

Explanation:

1. 10

2. 6 period

3. Na

4. bromine