To solve this problem, we need to understand the composition of an $\alpha$-particle.$\\ \\$An $\alpha$-particle is a type of nuclear particle that is emitted during radioactive decay.$\\$It is essentially a helium nucleus, which consists of:$\\$• 2 protons$\\$• 2 neutrons$\\ \\$This means that an $\alpha$-particle does not contain any electrons, as it is a bare nucleus.$\\ \\$Let's analyze the options:$\\$Option 1: 2 protons and 2 neutrons only$\\$• This is correct because it matches the composition of an $\alpha$-particle.$\\ \\$Option 2: 2 electrons, 2 protons and 2 neutrons$\\$• This is incorrect because an $\alpha$-particle does not contain electrons.$\\ \\$Option 3: 2 electrons and 4 protons only$\\$• This is incorrect because it suggests a different composition, not matching an $\alpha$-particle.$\\ \\$Option 4: 2 protons only$\\$• This is incorrect because it lacks the neutrons that are part of an $\alpha$-particle.$\\ \\$Therefore, the correct option is Option 1: 2 protons and 2 neutrons only.