3.2 More about Atoms Flashcards

1
Q

Subatomic particles

A

Atoms have protons and neutrons in the nucleus and a cloud of electrons that moves around the nucleus.

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2
Q

How is the mass of nucleons measured?

A

Their mass is measured in atomic mass units.

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3
Q

Charge and mass of a proton

A

1 unit, 1+ charge

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4
Q

Charge and mass of a neutron

A

1 unit, neutral charge

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5
Q

Charge and mass of an electron

A

Almost nothing, 1- charge

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6
Q

Atomic number

A

The atomic number or the proton number is the number of protons in the nucleus of an atom.

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7
Q

Overall Charge

A

Every atom has an equal number of protons and electrons to have no overall charge.

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8
Q

What is the nucleon number

A

Protons and neutrons form the nucleus so are called nucleons. The total number of nucleons is called its nucleon number or mass number.

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