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Chemistry CBSE Live product
Class 9 (2026-27)
Journey Inside the Atom
Atomic Number, Mass Number & Electronic Configuration
7.
Calculate the mass number
Question:
3
m.
Composition of the nuclei of two atomic species X and Y are given as under
X
Y
Protons
\(6\)
\(7\)
Neutrons
\(8\)
\(8\)
Give the
atomic mass
of X and Y and state the relation between the two species?
Mass number \(=\)
Number of electrons + Number of neutrons
Number of protons - Number of neutrons
Number of protons + Number of electrons
Number of protons + Number of neutrons
Mass number of
X
\(=\)
\(12\)
\(14\)
\(10\)
\(15\)
Mass number of
Y
\(=\)
\(17\)
\(13\)
\(15\)
\(14\)
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