AQA Chemistry Unit 3

Who proposed the law of octaves and when?
Newlands, 1863
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Who created the basis for the modern periodic table and when?
Mendeleev, 1869
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Why was Mendeleev's tale better than Newlands?
Because he left gaps for undiscovered elements (and was basically more accurate)
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As you go down group one (which is a metal group), what happens to the reactivity of the elements? Why?
It increases because the outer electrons get further away (as the number of shells increases) from nucleus and are less attracted to it, so, they can be lost to other elements easily.
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As you go down group 7 (which is a non-metal group), what happens to the reactivity of the elements? Why?
It decreases because non-metals gain electrons and the attractive force of the nucleus decreases as more shells are added.
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Which group contains the alkali metals?
Group 1
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What do the alkali metals readily react with?
Air and water
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What are the alkali metals (in order of reactivity)?
Lithium, Sodium, Potassium, Rubidium, Caesium and Francium
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When did Newland's present his idea to the Chemical Society?
1865
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What are three reasond for why Newlands' tabel was not accepted?
1= His groups didn't contain elements of similar properties. 2= He mixedup non-metals and metals. 3= He didn't leave gaps
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What order did Mendeleev put his table in order of?
Atomic mass
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What was special about Mendeleev's periodic table?
He left gaps
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Other cards in this set

Card 2

Front

Who created the basis for the modern periodic table and when?

Back

Mendeleev, 1869

Card 3

Front

Why was Mendeleev's tale better than Newlands?

Back

Preview of the front of card 3

Card 4

Front

As you go down group one (which is a metal group), what happens to the reactivity of the elements? Why?

Back

Preview of the front of card 4

Card 5

Front

As you go down group 7 (which is a non-metal group), what happens to the reactivity of the elements? Why?

Back

Preview of the front of card 5
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