The first 20 elements on the periodic table and number of their neutrons?

1 thought on “The first 20 elements on the periodic table and number of their neutrons?”

1. Atomic Number Element Symbol

   1 Hydrogen H

   2 Helium He

   3 Lithium Li

   4 Beryllium Be

   5 Boron B

   6 Carbon C

   7 Nitrogen N

   8 Oxygen O

   9 Fluorine F

   10 Neon Ne

   11 Sodium Na

   12 Magnesium Mg

   13 Aluminium Al

   14 Silicon Si

   15 Phosphorus P

   16 Sulfur S

   17 Chlorine Cl

   18 Argon Ar

   19 Potassium K

   20 Calcium Ca

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