Question

Please tell me the molecular mass of 1st 20 elements.
PLEASE!! ​

Answer 1

Explanation:

Atomic masses of first 20 elements :-

H. ----> 1

He ----> 2

Li ------> 7

Be -----> 9

B -------> 11

C ------> 12

N ------> 14

O ------> 16

F ------> 19

Ne ----> 20

Na -----> 23

Mg -----> 24

Al ------> 27

Si ------> 28

P -------> 31

S -------> 32

Cl ------> 35.5

Ar -----> 40

K ------> 39

Ca ----> 40