sc4, the periodic table (paper 1 and 2) Flashcards

1
Q

how did mendeleev order the periodic table

A
  • increasing relative atomic mass
  • he kept missing gaps in the table
  • sometimes swapped elements for better suited chemical properties
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2
Q

why did mendeleev leave gaps in his table

A
  • some chemical and physical properties didnt line up with the increasing relative atomic mass
  • so he thought other elemetns were to be discovered
  • he guessed their properties
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3
Q

give reasons for why early scientists didn’t believe in mendeleevs table

A
  • there were gaps
  • hydrogen wasn’t properly placed
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4
Q

how did mosely show RAM was a physical property

A
  • he fires high energy electrons at different elements
  • which gave off x rays
  • every step increase in atomic number, there was a step change in the energy of these x rays
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5
Q

explain how ordering by relative atomic masses could be wrong

A

becuz of isotopes

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