Question

Write the atomicity of first 20 elements. ???

Answer 1

Hydrogen-1 H 1
Helium-4 He 2
Lithium-7 Li 3
Beryllium-9 Be 4
Boron-11 B  5
Carbon- 12 C 6
Nitrogen-14 N 7
Oxygen- 16 O 8
Fluorine-19 F 9
Neon-20 Ne 10
Sodium-23 Na 11
Magnesium-24Mg 12
Aluminium-27 Al 13
Silicon- 28  Si 14
Phosphorus-31  P 15
Sulphur - 32 S 16
Chlorine - 35.5  Cl
Argon-. 40Ar 18
Potassium - 39 K 19
Calcium- 40Ca20

Answer 2

Atomicity: Atomicity is the total number of atoms present in a molecule of an element or compound. For example Ozone(O3) has 3 oxygen atoms. So it's atomicity is 3.

Monoatomic- consists of one atom. Example-Na,K,Ne etc

Diatomic- Consists of two atoms. Example-O2,N2,H2 etc

Triatomic- Consists of three atoms. Example- O3

Polyatomic- Consists of more than 3 atoms. Example- P4, S8 etc

Generally metals are monoatomic. Also Noble or inert gases are monoatomic. Non metals vary from monoatomic, diatomic to polyatomic. Following is the list of first 20 elements and their Atomicity.

Hydrogen(H2)- 2

He - 1

Li- 1

Be- 1

B - It has Allotropes

C-2,4

N2– 2

O2– 2

F2- 2

Ne- 1

Na- 1

Mg- 1

Al-1

Si-Network lattice

P4– 4

S8– 8

Cl2– 2

Ar-1

K- 1

Ca- 1