C3-Periodic Table

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  • Created by: Ira G
  • Created on: 11-04-16 12:09
Which scientist is our modern periodic table most influenced by?
Dmitri Mendeleev
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Why was Newlands' work not accepted by other scientists? (3 marks)
His groups contained elements that didn't have similar properties (carbon and titanium)-he mixed up metals and non metals (oxygen and iron)-no gaps were left for undiscovered elements
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Why was Mendeleev's periodic table accepted by other scientists?
He left gaps for undiscovered elements so that those with similar properties could stay in the same groups
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What does the group number tell us?
How many electrons are on the outermost shell.
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What does the period tell us?
How many shells there are.
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What happens to the elements reactivity as you go down group 1 and why?
They become more reactive because there are more inner shells shielding the outer electron from the positive charge of the nucleus. This means the electron on the outer shell is lost easily.
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What happens to the elements reactivity as you go down group 7 and why?
They become less reactive because there is an increased distance between the nucleus and outer shell. this means it is difficult to gain electrons.
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What happens to the properties of elements as you go down group 1?
They have lower melting and boiling points.
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what happens to the properties of elements as you go down group 7?
They have higher melting and boiling points.
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Other cards in this set

Card 2

Front

Why was Newlands' work not accepted by other scientists? (3 marks)

Back

His groups contained elements that didn't have similar properties (carbon and titanium)-he mixed up metals and non metals (oxygen and iron)-no gaps were left for undiscovered elements

Card 3

Front

Why was Mendeleev's periodic table accepted by other scientists?

Back

Preview of the front of card 3

Card 4

Front

What does the group number tell us?

Back

Preview of the front of card 4

Card 5

Front

What does the period tell us?

Back

Preview of the front of card 5
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