the mas number (top number) - total number of protons and neutrons and the atomic number (bottom number) - number of protons.
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what are isotopes?
isotopes are different atomic forms of the same element, which have the SAME number of PROTONS but DIFFERENT number of NEUTRONS.
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what is ionic bonding?
in ionic bonding, atoms gain or lose electrons to form charged particles called ions, which are strongly attracted to each other.
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what are the properties of ionic compounds?
They all have high melting points and boiling points due to the strong attraction between the ions. When melted/liquid the ions are free to move so can carry electric current. They also dissolve easily in water.
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what is covalent bonding?
covalent bonding is where atoms share electrons to gain a full outer share, so a covalent bond is a shared pair of electrons.wh
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what is metallic bonding?
Metals consist of a giant structure. Metallic bonds involve free electrons (also known as delocalised electrons).
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what do free/delocalised electrons do?
They are free to move so metals are good conductors of heat and electricity. They also hold the atoms together in a regular lattice, which means there are strong forces of electrostatic attraction between ions. Metals can also be bent and shaped.
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what is an alloy?
an alloy is a mixture of two or more metals. They are made because pure metals are often too 'soft' to do some jobs, and alloys are harder due to the different sizes atoms of the different metals distorting the layers.
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Other cards in this set
Card 2
Front
what are isotopes?
Back
isotopes are different atomic forms of the same element, which have the SAME number of PROTONS but DIFFERENT number of NEUTRONS.
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