Question

7) An alpha particle contains
(a) 4 positive charge and 2 mass unit
(b) 2 positive charge and 4 mass unit
(c) 2 positive charge and 2 mass unit
(d) 4 positive charge and 4 mass unit​

Answer 1

Answer:

option (b) 2 positive charge and 4 mass unit

Explanation:

alpha particles are positively charged particles

they consists of 2 protons and 2 neutrons..

therefore we can say that 2 positive charge and 4 mass unit

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Answer 2

An alpha particle contains (b) 2 positive charges and 4 mass units.

An alpha particle is a doubly charged helium nuclei.

Helium is the second element in the Modern Periodic table of elements. It has the atomic number 2. Its mass number is 4. He²⁺ is called an alpha particle.

The number of electrons in a neutral atom = Atomic number of the element

The number of nucleons/mass units in an atom = Mass number of the atom

So, the number of electrons in the Helium atom is 2.

The mass of Helium is 4 units.

For each electron removed from a neutral atom, the atom gains a positive charge.

If we doubly charge the Helium atom, two electrons will be removed from it. Since Helium has only two electrons, only nucleons will be left in the Helium. Thus, it can be called a doubly-charged Helium nucleus.

Therefore, an alpha particle contains (b) 2 positive charges and 4 mass units.