Question

Composition of atom of first 30 elements with valency

Answer 1

Here, I’m writing the approximate atomic masses of the most common and most stable isotopes of each element.

H - 1 u

He - 4 u

Li - 7 u

Be - 9 u

B - 11 u

C - 12 u

N - 14 u

O - 16 u

F - 19 u

Ne - 20 u

Na - 23 u

Mg - 24 u

Al - 27 u

Si - 28 u

P - 31 u

S - 32 u

Cl - 35.5 u

Ag - 40 u

K - 39 u

Ca - 40 u

Sc - 45 u

Ti - 48 u

V - 51 u

Cr - 52 u

Mn - 55 u

Fe - 56 u

Co - 58.6 u

Ni - 59 u

Cu - 63.5 u

Zn - 65.4 u

Ga - 70 u

Ge - 73 u

As - 75 u

Se - 79 u

Br -80 u

Kr - 84 u

Rb - 85 u

Sr - 87.6 u

Y - 89 u

Zr -91 u

Nb - 93 u

Mo - 96 u

Tc - 98 u

Ru - 101 u

Rh - 103 u

Pd - 106.4 u

Ag - 107.8 u

Cd - 112.4 u

In - 114.8 u

Sn - 118.7 u