Q8 of 203 Page 150

What is the name of a particle which contains 10 electrons, 11 protons and 12 neutrons?

The valence electrons present in sodium atom are 11. In the above statement, there is loss of one electron shown which makes it Sodium ion(Cation) denoted by Na+.


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6

Write down the formulae for the following compounds:

(a) Calcium oxide


(b) Magnesium hydroxide

 7

An element Z has a valency of 3. What is the formula of oxide of Z?

 9

Name the particle which has 18 electrons, 18 neutrons and 17 protons in it.

 10

Fill in the following blanks with suitable words:

(a) The particle which is formed by the gain of electrons by an atom is called ………….


(b) The particle which is formed by the loss of electrons by an atom is called ………….


(c) The particle which is formed by the loss or gain of electrons by an atom is called ……….


(d) A potassium ion has positive change because it contains less …………. than ………….


(e) A sulphide ion has negative charge because it contains less …………… than ……………