Periodic Table Flashcards

1
Q

Trend of atomic radius across the period

A
  • As number of protons increases, nuclear charge increases
  • Increase in shielding effect negligible as successive electrons added to the same electron shell
  • Increase in effective nuclear charge
  • Valence electrons more strongly attracted to nucleus
  • Atomic radius decreases across the period
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2
Q

Trend of atomic radius down the group

A
  • Down the group, nuclear charge increases as number of protons increases
  • Increase in shielding effect as number of shells increases
  • Valence electrons further away from nucleus, thus are less strongly attracted to the nucleus
  • Atomic radius increases down the group
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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12
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13
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14
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15
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20
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