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Chemistry CBSE Live product
Class 9 (2026-27)
Journey Inside the Atom
Atomic Number, Mass Number & Electronic Configuration
5.
TBQ - Calculation of atomic mass
Question:
2
m.
Solve the
question
given below
:
Boron
has
5
protons and
6
neutrons.
Calculate
the
atomic mass
.
Electron distribution in
Boron
Mass number =
Number of neutrons + Number of electrons
Number of positrons + Number of electrons
Number of protons + Number of neutrons
Number of protons + Number of electrons
Mass number of
Boron
is
11
2
3
1
.
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