Question

a mixture.
3. What is valency? Give the valencies of the following: oxygen, hydrogen, sodium, magnesium,
chlorine.
4. Classify the following as elements and compounds: water, nitrogen, carbon, hydrogen chloride,
magnesium, aluminium oxide, calcium carbonate.
5
what are the te​

Answer 1

valency is the number which denote how much electron should taken or given to stablis3 the the atom

1) oxygen -2

2) hydrogen =1

3) sodium =1

4) magnesium =2

5) chlorine =1

elements = nitrogen , carbon, magnesium,

compound = water , hydrogen chloride, aluminum oxide, calcium carbonate