Feb.19
Page 171 Question Numbers 1,2,3a,4
1.What is an ion?
Ans: An ion is an electrically charged atom or group of atoms. Ions are atoms that have lost or gained electrons during a chemical reaction.
2.What symbols do we use to indicate that atoms have become ions?
Ans: We use a positive and negative sign to indicate ions. The ion is negative if an atom gained electrons and its positive when the atom lost electrons.And the amount is written beside the signs as well.
3.What is the purpose of a subscript when writing the formula for the following?
a) a binary ionic compound
Ans: To distinguish the number of each ions/element.
4.What combinations of two elements combine to form ionic compounds?
Metal and Non-metals.
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