Question

write first20 elements of table with their atomic number electronic configuration with atomic mass number with valency​

Answer 1

Answer:

Explanation:

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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Answer 2

1 hydrogen

2 helium

3 lithium

4 beryllium

5 boron

6 carbon

7nitrogen

8oxygen

9 fluorine

10 neon

11sodium

12 magnesium

13 aluminum

14 silicon

15 phosphorus

16 sulphur

17 chlorine

18 argon

19 pottasium

20 calcium