Fill in the blanks: A group of atoms carrying a fixed charge on them is called..................…

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Solution

Polyatomic ions:
Poly means many.
Polyatomic ions are ions that contain more than one atom.
These ions are created when several atoms come together to form a group held together by covalent bonds.
Examples: ${OH}^{-}$ and ${SO}_{4}^{- 2}$
Hence, a group of atoms carrying a fixed charge on them is called polyatomic ions.

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Question 44
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(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. 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 charge because it contains less ___ than ___.
(e) A sulphide ion has negative charge because it contains less ___ than ___.

Q. Fill in the following blanks with suitable words :
(a) The particle which is formed by 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 charge because it contains less .................... than ...................
(e) A sulphide ion has negative charge because it contains less ....................... than ...................

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