Chemistry C3 1.1

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How did the periodic table of the elements develop?
It developed as chemists tried to classify the elements.
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How does the periodic table arrange the elements?
It arranges them in a pattern in which similar elements are grouped together.
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How did Newlands' table arrange the elements?
In order of atomic weight.
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What did Newlands' table fail to do?
Take into account elements that were unknown at the time.
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How did Mendeleev's periodic table provide the basis for the modern periodic table?
It left gaps for the unknown elements.
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During the 19th century, many elements had been discovered but what did scientists not know about?
The structure of atoms.
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In the 19th century scientist tried to find ways to classify elements based on what?
Atomic weight and properties.
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Why did scientists in the 19th century use atomic weights rather than proton numbers to classify the elements?
Because they did not know about the structure of atoms.
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What did Newlands propose in 1863?
His law of octaves.
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What did Newlands' law of octaves state?
That similar properties are repeated every eighth element.
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How did Newlands' arrange his table?
He put the 62 elements known at that time into seven groups according to their atomic weights.
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Why didn't other scientists accept Newlands' ideas?
After calcium the properties of the elements did not match very well within the groups of Newlands' table.
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When did Newlands propose his law of octaves?
1863.
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When did Mendeleev produce a better table than Newlands?
1869.
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What was better about Mendeleev's table in comparison to Newlands'?
He left gaps for undiscovered elements so that the groups of known elements did have similar properties.
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What did Mendeleev predict?
Mendeleev predicted the properties of the missing elements, when some of the elements were discovered Mendeleev's predictions were confirmed.
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Other cards in this set

Card 2

Front

How does the periodic table arrange the elements?

Back

It arranges them in a pattern in which similar elements are grouped together.

Card 3

Front

How did Newlands' table arrange the elements?

Back

Preview of the front of card 3

Card 4

Front

What did Newlands' table fail to do?

Back

Preview of the front of card 4

Card 5

Front

How did Mendeleev's periodic table provide the basis for the modern periodic table?

Back

Preview of the front of card 5
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