GENERAL KNOWLEDGE

GK

NUCLEAR SCIENCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A helium nucleus with two protons and two neutrons is called a(n) ____
A
alpha particle
B
electroscope
C
beta particle
D
gamma ray
Explanation: 

Detailed explanation-1: -Alpha particles are essentially helium nuclei with two protons and two neutrons bound together. The consequence of their high mass and electrical charge is their inability to penetrate as deep as other particles such as protons and electrons.

Detailed explanation-2: -An alpha particle is identical to a helium atom that has been stripped of its two electrons; thus, an alpha particle contains two protons and two neutrons. Because an alpha particle has no electrons to balance the positive charge of the two protons, it has a charge of +2 and can be represented as He2+.

Detailed explanation-3: -What are alpha particles? Alpha particles (a) are composite particles consisting of two protons and two neutrons tightly bound together (Figure 1). They are emitted from the nucleus of some radionuclides during a form of radioactive decay, called alpha-decay.

Detailed explanation-4: - Particles have a positive charge and are identical with helium nuclei, and consist of two protons and two neutrons. They result from the radioactive decay of heavy elements such as radium, thorium, uranium, and plutonium.

Detailed explanation-5: -An alpha particle consist of two protons and two neutrons bound together into a particle identical to helium – 4 nucleus ( He2+).

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