atomic number and mass number of 1 to 20 elements with symbol
Answers
Answer:
The solution is below.
Explanation:
Atomic number is the number of proton elements in a nucleus.
Mass number = no. of protons + no. of neutrons.
Atomic number and mass number of first 20 elements are listed below:
Atomic Number Symbol Element Name Mass Number
1 Hydrogen 1
2 Helium 4
3 Lithium 7
4 Beryllium 9
5 Boron 11
6 Carbon 12
7 Nitrogen 14
8 Oxygen 16
9 Fluorine 19
10 Neon 20
11 Sodium 23
12 Magnesium 24
13 Aluminium 27
14 Silicon 28
15 Phosphorus 31
16 Sulphur 32
17 Chlorine 35.5
18 Argon 40
19 Potassium 39
20 Calcium 40
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