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15 Cards in this Set

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All atoms contain...
protons, neutrons and electrons
How are protons, neutrons and electrons charged?
Protons- positively
Neutrons- no charge
Electrons negative
Describe protons and neutrons
Protons and neutrons are the Heavy particles in an atom. They have a mass of one atomic mass unit and they are found in nucleus.
Describe electrons
They have tiny mass
They orbit the nucleus in shells.
1st shell holds 2 electrons 2nd and 3rd hold 8 electrons.
What is the ATOMIC NUMBER?
The number of protons (which equals the number of electrons)
What is the MASS NUMBER?
Number of protons+ number of neutons
What are isotopes?
They are atoms with same number of protons, but with different number of protons.
Group 1
The alkali metals
Soft metals stored under oil
Low densities
Low melting points
Tarnish in air
Most reactive group of metals
Get more reactive as you go down the group
Group 2
The alkaline earth metals
Higher melting points and densities tha group 1
Less reactve than group 1
Get more reactive as you go down the group
Transition metals
Hard and dense
High melting points
Less reactive than group 1 and 2
Form coloured compounds
Can form comound with more than one formula
Are important catalysts in industry
Magnetic metals
Iron, cobalt and nickel
Group 7
Are called halogens
Exist as diatomic molecules
Reactive group of non-metals
Get less reactive as you go down the group
Group 8 or 0
Called nobel gases
Exist as single atoms
Very unreactive
Full outer shell
Group number
Elements group number equals the number of electrons on the outer shell
Reactivity series
Lists metals in order of reactivity