Why do atoms have no overall electric charge?

Atoms contain the same number of protons (+1 charge) and electrons (-1 charge) so the charges cancel out.

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What is the relative mass and charge of a neutron?

Relative mass: 1 

Relative charge: 0

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What is the relative mass and charge of an electron.

Relative mass: 0.0005

Relative charge: -1

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What is the relative mass and charge of a proton.

Relative mass: 1

Relative charge: +1

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Do atoms of the same element always have the same number protons, neutrons or electrons?

Atoms of the same element always have the same number of protons.

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Describe the locations of the sub-atomic particles in an atom.

Protons and neutrons are located in the nucleus.

Electrons are located in electron shells or energy levels. 

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What information about subatomic particles does the mass number of an atom provide?

 The mass number tells you the total number of nucleons (protons and neutrons) in the nucleus.

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What information about subatomic particles does the atomic number of an atom provide?

 The atomic number tells you the number of protons in the nucleus.

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How do atoms form ions?

Atoms form ions by losing or gaining electrons from their outer shell.

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What is a cation?

A cation is a positively-charged ion.

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What is an anion?

An anion is a negatively-charged ion.

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Give one similarity and one difference between atoms and ions of the same element.

Similarity: same numbers of protons

Difference: different numbers of electrons

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