Question

Which answer best describes an alpha particle?


a neutrino emitted during alpha decay

a positively charged nucleus with two protons and two neutrons

a particle that has no mass and no charge

an electron emitted by an unstable nucleus

Answer 1

Answer:

A positively charged nucleus with two protons and two neutrons

Explanation:

Alpha particles consists of a positively charged nucleus with two protons and two neutrons. When alpha decay of a heavy element takes place, an alpha particle generally produced. It is represented as $^4_2He$.

In an alpha decay, the mass number of an atom decreases by four and its atomic number decreases by 2.

For example, when the alpha decay of Uranium 238 happens it decays to thorium along with alpha particle.

$^{238}_{92}U\rightarrow^{234}_{90}Th+^4_2\alpha$

Hence, the correct option is (B) " a positively charged nucleus with two protons and two neutrons  ".

Answer 2

The alpha particle represents helium . The right option is option B

CHARACTERISTICS OF ALPHA PARTICLE

• Alpha particle has the following characteristics

• It is represented with the helium atom

• It is positively charged

• It has large ionization

• it has least penetration

• it can be stopped by paper

The best answer that describe an alpha particle is a positively charged nucleus with two protons and two neutrons

Therefore, the best answer is the option B.

Learn more about alpha particle here: https://brainly.com/question/2320811