Electron

Definition

An electron is a subatomic particle with a negative electric charge, found in all atoms. It plays a key role in chemical bonding and electricity.

5 Must Know Facts For Your Next Test

1. Electrons are located in the electron cloud surrounding the nucleus of an atom.
2. The mass of an electron is approximately 1/1836 that of a proton.
3. J.J. Thomson discovered the electron in 1897 through his cathode ray experiments.
4. Electrons occupy defined energy levels or shells around the nucleus.
5. Valence electrons are the outermost electrons and are crucial in determining an element's chemical properties.

Review Questions

• Who discovered the electron and how?
• Where are electrons located within an atom?
• What is the significance of valence electrons?

Related terms

Proton: A positively charged subatomic particle found in the nucleus of an atom.

Neutron: A neutral subatomic particle found in the nucleus of an atom.

$Electron\ Configuration$: $The\ arrangement\ of\ electrons\ in\ an\ atom's\ energy\ levels.$