Question

What is the number of valence electrons in chlorine atom?
4. An element Z has a valency of 3.What is the formula of oxide of Z

Answer 1

Answer:

3. chlorine has a valency of +1 atom

Explanation:

It is because in an chlorine atom the first shell has 2electrons, 2nd shell has 7electrons

Answer 2

• The number of valence electrons in the chlorine atom is 7 .The atomic number of chlorine is 17. So its electronic configuration is 2,8,7. So there are 7 valence electrons.

• We are given that the element Z has a valency of 3. The oxide ion is denoted by O 2− and has a valency of 2. So in order to find the chemical formula of the compound, we will cross over the valencies of the two combining atoms. Thus the chemical formula of the substance will be Z 2 O 3

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