Heena Sharma, Shubhankat Vats and, Rashmi Gupta Solutions for Chapter: Structure of the Atom, Exercise 3: Check Point 03

What are the number of protons, neutrons, and electrons in ${}_8{}^{16}\mathrm{O}$ and ${}_{18}{}^{40}\mathrm{Ar}$? What are their atomic number and mass number?

The atomic numbers of $\mathrm{Al}$ and $\mathrm{C}\mathrm{l}\mathrm{}$ are $13$ and $17$ respectively. What will be the number of electrons in ${\mathrm{Al}}^{3+}$and $\mathrm{C}{\mathrm{l}}^{-}$?

Lithium atom has an atomic mass of $6 \mathrm{u}$ and three protons in its nucleus. How many neutrons does it have?

An atom has an atomic mass of $7 u$. It has $2$electrons in K-shell and one electron in L-shell. How many neutrons does it have?

Why are the atomic masses of most of the elements are fractional and not whole numbers?

Identify the isotopic pair(s) out of the following species?
${{}_8\mathrm{C}}^{16},{}_6{\mathrm{C}}^{14},{}_7{\mathrm{N}}^{14},{}_8{\mathrm{O}}^{18},{}_7{\mathrm{N}}^{16}$

Name the isotope used as a fuel in nuclear reactors.

What is the number of subatomic particles in $\mathrm{U}-235$ isotope?