Q9 of 203 Page 150

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

The valence electrons present in chlorine atom are 17. In the above statement, there is gain of one electron shown which makes it chloride ion(anion) denoted by Cl-.


More from this chapter

All 203 →
7

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

 8

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

 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 ……………

 11

Name the elements water is made of. What are the valencies of these elements? Work out the chemical formula for water.