EL 4 Organising the elements of life

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  • Created by: LBCW0502
  • Created on: 19-12-15 14:55
Who created the early periodic table?
Mendeleev
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How were the elements organised in the early periodic table?
The elements were put in order of atomic mass
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How are the elements organised in the modern periodic table?
The elements are in order of atomic number
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Why did Mendeleev leave gaps in his table?
For undiscovered elements
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What is periodicity?
The occurrence of periodic pattern
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What are the names of the blocks in the periodic table?
s-block, d-block, p-block and f-block
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What are vertical columns in the periodic table called?
Groups
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What are the horizontal rows in the periodic table called?
Periods
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What is the general trend for melting and boiling points across a period?
Across the period, the melting and boiling points increase then decrease
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What is the explanation for the high melting and boiling points from sodium to silicon in period 3?
(Na, Mg, Al), there is metallic bonding (strong electrostatic force of attraction between the positive metal ions and the delocalised electrons). (Si), there is a giant covalent structure with strong covalent bonds. Both require more energy to break
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What is the explanation for the low melting and boiling points from phosphorous to argon in period 3?
There are weak intermolecular forces between the molecules, which are easier to overcome and requires less energy
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What does the number of outer electrons determine?
The group number
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What does the number of energy levels determine?
The period the element is in
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Why do noble gases have a closed shell arrangement?
They have a full outer shell with a particularly stable arrangement
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What ions do group 1 elements form?
1+ ions
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What ions do group 2 elements form?
2+ ions
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What ions do group 7 elements usually form?
1- ions
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What ions do group 6 elements form?
2- ions
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What ion does aluminium form?
3+ ion
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Other cards in this set

Card 2

Front

How were the elements organised in the early periodic table?

Back

The elements were put in order of atomic mass

Card 3

Front

How are the elements organised in the modern periodic table?

Back

Preview of the front of card 3

Card 4

Front

Why did Mendeleev leave gaps in his table?

Back

Preview of the front of card 4

Card 5

Front

What is periodicity?

Back

Preview of the front of card 5
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