atoms and elements Flashcards

1
Q

radius of an atom

A

0.1 nanometres (1 x 10⁻¹⁰ m)

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2
Q

radius of a nucleus

A

1 x 10⁻¹⁴ m (around 1/10000 radius of an atom)

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3
Q

list the sub-atomic particles

A

protons, neutrons, electrons

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4
Q

mass and charge of proton

A

1, +1

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5
Q

mass and charge of neutron

A

1, 0

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6
Q

mass and charge of electron

A

1/1840, -1

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7
Q

charge of an atom

A

0, neutral

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8
Q

why do atoms have a neutral charge

A

they have the same number of protons and electrons so the charges cancel out

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9
Q

atomic number

A

number of protons

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10
Q

mass number

A

total number of protons and neutrons

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11
Q

how to work out number of neutrons

A

mass number-atomic number

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12
Q

elements

A

substance consisting of the same atoms

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13
Q

which number determines the type of atom

A

proton number

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14
Q

what is an atom?

A

the smallest part of an element that can exist

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15
Q

what is an element?

A

a substance of only one type of atom

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16
Q

what are the two groups elements can be classified in?

A

metals and non-metals