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Subjects
Science State Board
Class 9
Atomic structure
Atomic particles - Rutherford’s and Bohr’s models
7.
Atomic mass: Problem solving question
Exercise condition:
3
m.
Solve the
problem
given below
:
1
.
Beryllium
has
4
protons and
5
neutrons.
Find
the
atomic mass
.
Answer
:
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