Atoms & molecules

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Science

Last updated 12:13 PM on 8/5/26
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9 Terms

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Proton

Relative mass: 1

Relative charge: -1

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Neutron

Relative mass: 1

Relative charge: 0

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Electron

Relative mass: 1/1840

Relative charge: -1

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Why is an atom said to be electrically neutral?

Because the number of positively charged protons is equal to the number of negatively charged electrons, which makes the atom balanced

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Maximum electronic configuration

2,8,8,2

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Which elements belong to group 18 on the periodic table?

Noble gases, which means that their atoms have full valence shells, so they are stable and unreactive (inert)

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Molecule

2 or more atoms chemically joined together

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Anion

Negatively charged ion

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Cation

Positively charged ions