C3.1- The Periodic Table Part 3

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Newlands arranged his periodic table by
order of relative atomic mass
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He thought there was a law of
Octaves
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The law of Octaves was
the idea that the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur every 8th element
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The problem with ordering them in order of atomic mass was
some atomics were is groups that they didn't fit in hence why his ideas weren't accepted
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Other reasons why people didn't accept his ideas
not all elements have similar properties, there were often 2 elements in the same box
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Mendeleev arranged his table
in the same way as Newlands (order of relative atomic mass)
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But he realised that
chemical properties of elements were related to their atomic mass in a 'periodic' way,
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So ordered them in
vertical columns
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He left
gaps in the table, thinking that there must be elements which fit in the gaps
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People credited him because
it turned out he was right to leave gaps, elements were later found which fit in those gaps
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However in 1869 people didn't because
there were gaps, not always in order of atomic mass and some metals and non metals were together
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Subatomic particles were discovered after which showed
that Mendeleev had placed them in order of atomic number
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Other cards in this set

Card 2

Front

He thought there was a law of

Back

Octaves

Card 3

Front

The law of Octaves was

Back

Preview of the front of card 3

Card 4

Front

The problem with ordering them in order of atomic mass was

Back

Preview of the front of card 4

Card 5

Front

Other reasons why people didn't accept his ideas

Back

Preview of the front of card 5
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