first 20 mass numbers

What is the mass number of Hydrogen (H)?

1

What is the mass number of Helium (He)?

4

Lithium (Li) has an mass of __________.

6.94 or 7

What is the mass number of Beryllium (Be)?

9

Boron (B) has an mass of __________.

10.81 or 11

What is the mass number of Carbon (C)?

12

What is the mass number of Nitrogen (N)?

14

Oxygen (O) has an mass of __________.

15.999 or 16

Fluorine (F) has an mass of __________.

18.998 or 19

What is the mass number of Neon (Ne)?

20

Sodium (Na) has an mass of __________.

22.990 or 23

What is the mass number of Magnesium (Mg)?

24

Aluminum (Al) has an mass of __________.

26.982 or 27

What is the mass number of Silicon (Si)?

28

Phosphorus (P) has an mass of __________.

30.974 or 31

What is the mass number of Sulfur (S)?

32

What is the mass number of Chlorine (Cl)?

35

Argon (Ar) has an mass of __________.

39.948 or 40

What is the mass number of Potassium (K)?

39

What is the mass number of Calcium (Ca)?

40