Question

Write the characteristics of electrons.​

Answer 1

Three sub-atomic particle of atom are proton, neutron and electron.

◆ Characteristics of electrons -

Electrons are negatively charged particles.

They revolve around the nucleus in various energy levels.

They can be excited to higher energy levels by absorbing energy.

Mass of electron is 1/2000 times of proton/neutron.

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Answer 2

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★ Characteristics of electrons.

i) Mass of electron

$\longrightarrow$ The mass of electron is about $\sf \frac{1}{1840}\\$ of a mass of hydrogen atom. since the mass of hydrogen atom is 1 u. So, the relative mass of electron is $\sf \frac{1}{1840}\\$.

$\longrightarrow$ This is negligible.

$\longrightarrow$ Thus, the mass of electrons ignored. While calculating atomic mass of an element.

ii) charge of elections

$\longrightarrow$ The absolute charge of an election is $\sf 1.6×10^{-19}$ coulomb of negative charge.

$\sf 1.6×10^{-19}$ coulomb is the smallest charge, it is used at unit. So, electron has unit negative charge.

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