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Mole Concept and Avogadro's Number

When an alpha...

Question

When an alpha particle gains two electrons it becomes a neutral atom of an element which is a rare gas. Name of this rare gas is

A

Helium atom

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B

Argon atom

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C

Hydrogen atom

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D

Neon Atom

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Solution

The correct option is A
Helium atom

An alpha particle which is effectively a He – nucleus with a charge of +2 units gains two electrons to become a neutral He – atom.

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Q. Temperature at which rms speed of an atom in an argon gas cylinder equal to the rms speed of a helium gas atom at

- 20^{\circ} C

is
(Take molar mass of argon as

40 g

and for helium as

4 g

)

Q. Temperature at which rms speed of an atom in an argon gas cylinder equal to the rms speed of a helium gas atom at

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is
(Take molar mass of argon as

40 g

and for helium as

4 g

)

Q. When a neutral atom loses an electron, it is called _____ and when it gains an electron, it is called _____.

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