How many elements are in the following compound: CaCO3
3
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How are elements organised?
Elements are organised by their atomic number numerically
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How do you work out the number of neutrons in an element?
You subtract the atomic number from the atomic mass. For example, mass of 19=9-10. 10 neutrons
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Which group of metals are the most reactive?
Group 1 and 2, group 1 is referred to as the alkali metals.
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What does the middle section of the periodic table show?
Transition metals.
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Which group of non-metals is the most reactive
7, the halogens.
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Which group is the least reactive?
8/0, the noble gases.
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What does the group number tell you?
The number of electrons on the atoms outer most shell. It also tells you how reactive they are. For example, group 1 most reactive non metals as they only need to lose one electron in order to become stable.
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What does the period number tell you?
It tells you the number of shells which surround the nucleus.
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Other cards in this set
Card 2
Front
How are elements organised?
Back
Elements are organised by their atomic number numerically
Card 3
Front
How do you work out the number of neutrons in an element?
Back
Card 4
Front
Which group of metals are the most reactive?
Back
Card 5
Front
What does the middle section of the periodic table show?
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