Question

What is the mass number of neon (Ne)?
A. 20
B. 18
C. 10
D. 2​

Answer 1

A

Step-by-step explanation:

it is round up to 20

Answer 2

20 is the answer (A)

Step-by-step explanation:

Neon/Atomic mass

20.1797 u

this is approximately 20 so 20 is the answer (A)

hope this helps!