Question

the relative atomic mass of the first 20 elements

Answer 1

H-1.0078 ~ 1 g

He- 4 g

Li-7 g

Be- 9 g

B- 10 g

C - 12 g

N - 14 g

O -16 g

F -19 g

Ne -20 g

Na-23 g

Mg- 24 g

Al- 27 g

Si- 28 g

P- 31 g

S- 32 g

Cl-35.5

Ar-40 g(39.948 g)

K-39 g

Ca- 40 g