first 20 elements with valency symbol electrons and E.C
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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"
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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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