Question

an alpha particle is not represented by which of the following symbols:a, 4/2He, 4/2a, 1/1p

Answer 1

In an neutral or uncharged atom (X), the atomic number (Z) s equal to the number of electrons or protons. The sum of the atomic number (Z) and the number of neutrons (N) gives the mass number A of an atom.

So atom can be represented as ^AX_Z where A = Z + N

So, an  alpha particle which is actually Helium nucleus , consists of two protons and two 'neutrons.That is why,  alpha particle can be reperesented by ⁴He₂ because it"s mass no is 4 and atomic no is 2.

It can also be reperesented by ⁴a₂ where a stands for alpha

But alpha particle cannot be reperesented by¹p_{1 .}