Atoms and electrons Flashcards

1
Q

Atomic number

A

number of protons in an atom of an element

proton number

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2
Q

Mass number

A

number or protons and neutrons in the nucleus of an element

nucleon number

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3
Q

Ion

A

electrically charged particle
formed by loss or gain of electrons

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4
Q

Isotopes

A
  1. atoms of same element
  2. same atomic number
  3. different mass number
  4. same number of protons
  5. different number of neutrons
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5
Q

Relative isotopic mass

A

mass of an atom of an isotope compared with 1/12th mass of carbon-12

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6
Q

Relative atomic mass

A

weighted mean mass of an element compared with 1/12th mass of carbon-12

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7
Q

First ionisation energy

A

energy required to remove 1 electron from each atom in 1 mol of gaseous atoms to produce 1 mol gaseous 1+ions

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8
Q

Orbital

A
  1. region of negative charge around the nucleus of an atom
  2. can hold max 2 electrons
  3. spin in opposite directions
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9
Q

Draw electronic configurations up to 3D

A
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10
Q

Draw S orbitals

A
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11
Q

Draw P orbitals

A
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12
Q

Ground state

A
  1. how element naturally exists
  2. electrons in lowest energy position
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13
Q

Evidence for electron shells

A
  1. Ionisation energy
  2. large jumps in energy
  3. electron is removed from shell nearer to nucleus
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14
Q

Relative molecular mass

A

average mass of one mol of of an element of compound
compared to 1/12 mass of c12

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15
Q

Mean weighted mass

A

Mean average of isotopes atomic masses
taking into account abundance

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