Periodic trend

1 Calcium, on the left of Period 4 of the Periodic Table, is more metallic than bromine on the right of this period.

Why is this?

Calcium has

• fewer electrons

• fewer protons.

• fewer full shells of electrons.

• fewer outer shell electrons.

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1 The diagram shows one period of the Periodic Table.

Which two elements form acidic oxides?

• carbon and lithium

• carbon and neon

• carbon and nitrogen

• nitrogen and neon

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Which property of elements increases across a period of the Periodic Table?

• metallic character

• number of electron shells

• number of outer shell electrons

• tendency to form positive ions

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1 W, X, Y and Z are elements in the same period in the Periodic Table.

W and Y are metals. X and Z are non-metals.

Which shows the correct order of these elements across the period?

• 
• 
• 
• 

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Argon, Ar, has a higher relative atomic mass than potassium, K, but appears before it in the Periodic Table.

• Argon has fewer neutrons than potassium.

• Argon has fewer protons than potassium.

• Argon has more neutrons than potassium.

• Argon has more protons than potassium.

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In the outline of the Periodic Table below, some elements are shown as numbers.

Which two numbers are metals in the same period?

• 1 and 2

• 1 and 7

• 3 and 5

• 5 and 6

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In the Periodic Table, how does the metallic character of the elements vary from left to right across a period?

• It decreases.

• It increase

• It increases then decreases.

• It stays the same.

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Which statements about the trends across a period of the Periodic Table are correct?

1 Aluminium is more metallic than sodium.

2 Beryllium is more metallic than carbon.

3 Boron is more metallic than lithium.

4 Magnesium is more metallic than silicon.

• 1 and 2

• 1 and 3

• 2 and 4

• 3 and 4

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• A

• B

• C

• D

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• A

• B

• C

• D

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