ICSE Class 10 Physics 2020 Solved Paper

An atomic nucleus $A$ is composed of 84 protons and 128 neutrons. The nucleus $A$ emits an alpha particle and is transformed into a nucleus $B$ .

Question : 66 of 67

Marks: +1, -0

What is mass number of the nucleus

A

Solution:

Mass number of nucleus

{\A}=84+128

=212

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