Question

a-particle consists of:

• A. 2 protons and 2 neutrons only
• B. 2 electrons, 2 protons and 2 neutrons
• C. 2 electrons and 4 protons only
• D. 2 protons only

Answer 1

The Correct Option is A

An alpha particle, often represented as \(\alpha\), is a type of particle that is emitted during certain types of radioactive decay. Let's analyze the given options to determine which one correctly describes the composition of an alpha particle:

1. Understanding the composition of an alpha particle:
   • An alpha particle is actually the nucleus of a helium atom, specifically helium-4.
   • This means it consists of 2 protons and 2 neutrons. Protons are positively charged particles, while neutrons have no charge.
   • In its alpha form, it has no electrons, which distinguishes it from a neutral helium atom that would typically have 2 electrons.
2. Evaluating the options:
   • Option 1: 2 protons and 2 neutrons only - This is the correct composition of an alpha particle.
   • Option 2: 2 electrons, 2 protons and 2 neutrons - Incorrect, as there are no electrons in an alpha particle.
   • Option 3: 2 electrons and 4 protons only - Incorrect, alpha particles consist of 2 protons, not 4, and do not have electrons.
   • Option 4: 2 protons only - Incorrect, as this option does not account for the 2 neutrons present in an alpha particle.
3. Answer:
   • Therefore, the correct option is "2 protons and 2 neutrons only".

This solution clarifies why an alpha particle consists of 2 protons and 2 neutrons, ruling out other possible particle configurations.