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

To determine the composition of an alpha (α)-particle, we need to understand its structure according to nuclear physics.

1. An alpha (α)-particle is a type of nuclear particle consisting of two protons and two neutrons.
2. This particle is identical to the nucleus of a helium-4 atom, which is why it is often referred to as a helium nucleus.
3. No electrons are present in an alpha-particle because it is simply a helium nucleus and does not include electrons in its structure.
4. Given the options, let's evaluate them one by one:
   • Option 1: 2 protons and 2 neutrons only - This is correct as it matches the structure of an alpha (α)-particle.
   • Option 2: 2 electrons, 2 protons, and 2 neutrons - Incorrect, as an alpha (α)-particle does not include electrons.
   • Option 3: 2 electrons and 4 protons only - Incorrect, as the particle would then not be neutral, and doesn't fit the helium nucleus description.
   • Option 4: 2 protons only - Incorrect because it doesn't account for the neutrons that are equally part of the alpha-particle structure.
5. Thus, the correct answer is "2 protons and 2 neutrons only", which correctly describes an alpha-particle.

In conclusion, the composition of an alpha (α)-particle can only be accurately described by option 1, consisting of two protons and two neutrons, representing the helium-4 nucleus.