Question

1 to 20 elements and symbol and atomic num

Answer 1

Element Symbol Electrons in shell 1 Electrons in shell 2 Electrons in shell 3 Electrons in shell 4
Hydrogen H 1 - - -
Helium He 2 - - -
Lithium Li 2 1 - -
Beryllium Be 2 2 - -
Boron B 2 3 - -
Carbon C 2 4 - -
Nitrogen N 2 5 - -
Oxygen O 2 6 - -
Fluorine F 2 7 - -
Neon Ne 2 8 - -
Sodium Na 2 8 1 -
Magnesium Mg 2 8 2 -
Aluminium Al 2 8 3 -
Silicon Si 2 8 4 -
Phosphorus P 2 8 5 -
Sulfur S 2 8 6 -
Chlorine Cl 2 8 7 -
Argon Ar 2 8 8 -
Potassium K 2 8 8 1
Calcium Ca 2 8 8 2



If it help u please mark it as brainliest

Answer 2

Element Symbol Electrons in shell 1 Electrons in shell 2 Electrons in shell 3 Electrons in shell 4
Hydrogen H 1 - - -
Helium He 2 - - -
Lithium Li 2 1 - -
Beryllium Be 2 2 - -
Boron B 2 3 - -
Carbon C 2 4 - -
Nitrogen N 2 5 - -
Oxygen O 2 6 - -
Fluorine F 2 7 - -
Neon Ne 2 8 - -
Sodium Na 2 8 1 -
Magnesium Mg 2 8 2 -
Aluminium Al 2 8 3 -
Silicon Si 2 8 4 -
Phosphorus P 2 8 5 -
Sulfur S 2 8 6 -
Chlorine Cl 2 8 7 -
Argon Ar 2 8 8 -
Potassium K 2 8 8 1
Calcium Ca 2 8 8 2

Read more on Brainly.in - https://brainly.in/question/4985457#readmore