GCSE Chemistry: The periodic table

Groups, periods, and trends in reactivity across the table.

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What does the atomic number of an element represent?
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The number of protons in an atom's nucleus.
The periodic table arranges elements in order of increasing ?.
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atomic number
What are the vertical columns of the periodic table called?
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Groups.
What are the horizontal rows of the periodic table called?
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Periods.
Why do elements in the same group have similar chemical properties?
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They have the same number of electrons in their outer shell.
Group 1 of the periodic table contains the ?.
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alkali metals
What happens to the reactivity of alkali metals going down Group 1?
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Reactivity increases.
Group 7 of the periodic table contains the ?.
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halogens
What happens to the reactivity of halogens going down Group 7?
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Reactivity decreases.
Why are the noble gases (Group 0) unreactive?
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Their outer electron shells are full.
Where are metals located on the periodic table?
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On the left and centre of the table.

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