Practice portal › Nuclei › Radioactivity
Asked in CBSE AIPMT 1999 · Nature of alpha, beta and gamma radiation
An α-particle is the nucleus ⁴₂He: two protons and two neutrons, with no orbital electrons.
A neutral helium atom carries two electrons around that nucleus.
Stripping both electrons away is double ionisation, and what remains is exactly the bare nucleus.
So an α-particle is a doubly ionised helium atom, of charge +2e and mass number 4.
Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.
Practise this with a timer