History of the atom Flashcards

1
Q

What is the relative mass of protons, neutrons and electrons

A

The relative masses of a protons and a neutron are 1, the relative mass of an electron “1/1836”

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2
Q

What is the relative charge of protons, neutrons and electrons

A

The relative charge of a proton is +1, the relative charge of a neutron is 0 and the relative charge of an electron is -1

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3
Q

Every atom contains equal numbers of … and …

A

Protons and electrons

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4
Q

What is the atomic number

A

The number of protons in each atom of an element is known as the atomic number

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5
Q

How are elements in the periodic table arranged in order of

A

Atomic number (number of protons)

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6
Q

What sub-atomic particles make up the vast majority of the mass of the atom.

A

Protons and neutrons

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7
Q

What is the mass number

A

The number of protons plus the neutrons in the nucleus of the atom is called its mass number

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8
Q

How do you work out the number of neutrons

A

number of neutrons = mass number - atomic number

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9
Q

Nucleus (of an atom)

A

The very small and dense central part of an atom that contains protons and neutrons.

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10
Q

Proton

A

A tiny positive particle found inside the nucleus of an atom.

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11
Q

Neutron

A

A dense particle found in the nucleus of an atom. It is electrically neutral, carrying no charge.

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12
Q

Electron

A

A tiny particle with a negative charge. Electrons orbit the nucleus of atoms or ions in shells.

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