When an $α$ -particle is ejected, the atomic number of the atom decreases by ___________ .

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Solution

When an $α$ particles...
When an alpha particle is emitted from a nucleus, the nucleus loses two protons and two neutrons. This means the atomic mass number decreases by $4$ and the atomic number decreases by $2$ (it loses two protons)

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When an α-particle is ejected, the atomic number of the atom decreases by ___________ .

When an α particles...When an alpha particle is emitted from a nucleus, the nucleus loses two protons and two neutrons. This means the atomic mass number decreases by 4 and the atomic number decreases by 2 (it loses two protons)

When an $α$ -particle is ejected, the atomic number of the atom decreases by ___________ .

When an $α$ particles...
When an alpha particle is emitted from a nucleus, the nucleus loses two protons and two neutrons. This means the atomic mass number decreases by $4$ and the atomic number decreases by $2$ (it loses two protons)