Question

Hi
Can anyone give me the atomic and mass numbers of the elements 1-20.

Answer 1

                     atomic wt   Name    symbol     atomic no

               4.0026 Helium He        2

- Symbol             6.941 Lithium Li         3

- Atomic Mass      9.0122 Beryllium Be 4

- Electronegativity  10.811 Boron B          5

- Density               12.0107 Carbon C 6

- Melting point       14.0067 Nitrogen N 7

- Boiling point         15.9994 Oxygen O 8

- Vanderwaals radiu 18.9984 Fluorine F 9

- Year of discovery  20.1797 Neon Ne 10