Question

2. A sulphur atom contains 16 protons and 16 neutrons. Write its mass number and
atomic number
3. What are monovalent, divalent and trivalent elements? Give examples
4. Find the valency:
a) Mg Cle-The valency of chlorine is 1 and the valency of magnesium is
b) NH3 - The valency of nitrogen is 3 and that of hydrogen is​

Answer 1

Answer:

16 atomic no.

32 mass no.

2. atoms having one two or three charges are known as monovalent divalent and trivalent elements respectively eg C monovalent , Co divalent, Co2 trivalent

3. Mg =2+

H=1+

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