Question

find the valency of the element from 1 to 20



please help me ​

Answer 1

Answer:

Valency is the no of valence electrons in the outermost shell. See it does not have to be found out. You can learn it. Just remember that noble gases always have 0 valency. Hope it helps. Please mark me as brainliest

Explanation:

Hydrogen = 1

helium =0

lithium = 1

beryllium = 2

boron = 3

carbon = 4

nitrogen = 3

oxygen = 2

fluorine = 1

neon = 0

sodium = 1

magnesium = 2

aluminium = 3

silicon = 4

phosphorus = 3

sulphur = 2

chlorine = 1

argon = 0

potassium = 1

calcium = 2

Answer 2

Answer:

hydrogen

helium

lithium

berlium

boron

carbon

nitrogen

oxygen

flourien

neon

sodium

megnesium

alluminum

silicon

phosphorus

sulpher

clorien

argon

potasium

calcium