A group of atoms carrying a fixed charge on them is called :

polyatomic ion

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cation

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anion

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none of the above

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Solution

The correct option is A polyatomic ion
Ions may consist of single atom or multiple atoms. However, ions with group of atoms are called polyatomic ions. Examples of polyatomic anions include carbonate ion, $C O_{3}^{- 2}$ composed of carbon and oxygen, sulfate ion, $S O_{4}^{- 2}$ composed of sulfur and oxygen etc. An example of a polyatomic cation is ammonium ion, $N H_{4}^{+}$ , which consists of nitrogen and hydrogen. Cations are usually metal atoms and anions are either non-metals or polyatomic ions. The attraction between the two charges holds the atoms or molecules together. Electrostatic forces hold ionic bonds together.

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Question 44
Fill in the blanks

(a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called ___.

(b) A group of atoms carrying a fixed charge on them is called ___.

(c) The formula unit mass of $C a_{3} (P O_{4})_{2}$ is ____.

(d) Formula of sodium carbonate is ___ and that of ammonium sulphate is ____.

Q. Molecules consisting of more than three atoms are called polyatomic molecules.

A group of atoms carrying a charge is called__.

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