Following are some properties:
The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules.
The number of protons in the nucleus of the atom is equal to the atomic number $(Z).$
The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom $(M)$ is equal to the sum of the number of protons and neutrons in the nucleus.
The number of neutrons is equal to the difference between the mass number of the atom $(M)$ and the atomic number $(Z).$
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$1 \mathrm{~mol}$ of an ideal gas is kept in a cylinder, fitted with a piston, at the position $\mathrm{A}$, at $18^{\circ} \mathrm{C}$. If the piston is moved to position $B$, keeping the temperature unchanged, then ' $x$ ' $L$ atm work is done in this reversible process.
$\mathrm{x}=$ . . . . . . $\mathrm{L} \mathrm{atm.} \mathrm{(nearest} \mathrm{integer)}$
[Given : Absolute temperature $={ }^{\circ} \mathrm{C}+273.15$, $\left.\mathrm{R}=0.08206 \mathrm{~L} \mathrm{~atm} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\right]$