Question

first 20 elements with valency symbol electrons and E.C

Answer 1

Explanation:

compound of hydrogen and carbon, such as any of those which are the chief components of petroleum and natural gas.

"the rain is rich in benzene and hydrocarbons"

Answer 2

Answer:

Element Symbol Atomic Number Valency

Hydrogen H 1

Helium He 2

Lithium Li 3

Beryllium Be 4

Boron B 5

Carbon C 6 4

Nitrogen N 7

Oxygen O 8

Fluorine F 9

Neon Ne 10

Sodium Na 11

Magnesium Mg 12

Aluminum Al 13

Silicon Si 14

Phosphorus P 15

Sulphur S 16

Chlorine Cl 17

Argon Ar 18

Potassium K 19

Calcium Ca 20

Explanation:

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