18 gm

18 amu

18 mg

18 kg

1 mole of CO and 1 mole of N₂

1 mole of O₂ and 1 mole of CO₂

1 mole of O₂ and 1 mole of N₂

1 mole of CO and 1 mole of CO₂

Two orbital

Four orbital

Three orbital

one orbital

32

2

8

18

Third Period

Second Period

First Period

Fourth Period

Sharing Electrons

Donation of Electrons

Acceptance of Electrons

Repulsion force of Electrons

1

Cosθ

Sinθ

2

5

1

3

7

0

2ⁿ

2^n-1

2ⁿ⁺¹

Renal illness

Physical illness

Mental illness

Pulmonary illness

Plants

tournals

Crustaceans

Protozoa

Moss stage

Foliage lichen stage

Crustose lichen stage

Herbaceous (plant) stage

120°C

160°C

140°C

180°C

Algae

Virus

Bacteria

Fungi

Rhesus monkey

Rhinoceros

A patient

Discoverer