Question

write atomic mass and no of following
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Answer 1

Answer:

Atomic masses are

1. Na=23 units
2. K= 39 units
3. Si=28 units
4. Ar=40 units
5. B= 11 units
6. Br=80 units
7. Pb=207 units
8. Zn=65 units

hope it helps .....

Answer 2

Answer:

Explanation:

Atomic no:

Na = 11

K = 19

Si = 14

B = 5

Br = 35

Atomic mass:

Na = 22.9 amu

K = 39.0 amu

Si = 28 amu

B = 10amu

BR = 79.9 amu

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