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13 Cards in this Set
- Front
- Back
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Mass number = |
Total number of protons & neutrons |
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Atomic number= |
Number of protons and electrons |
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Atoms of different elements will have different numbers of ? |
Protons |
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Neutrons= |
Mass number-atomic number (big-little) |
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Mass of protons neutrons and electrons ? |
Proton 1 Neutron 1 Electron very small |
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Compounds are formed when |
Atoms of two or more elements are chemically combined together & it is difficult to separate the two original elements out again |
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Definition of isotopes |
Different atomic forms of the same element , which have the SAME number of PROTONS but a different number of NEUTRONS |
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Example of a pair of isotopes ? |
Carbon 12 and carbon 14 |
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What happens in ionic bonding ? |
Transfer of electrons-atoms lose of gain electrons to form charged particles (ions) which are then strongly attracted to one another (because of the attraction of opposite charges ,+ and -) |
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What do atoms 'want' |
A shell with just one electron 'wants' to get rid of it to become an ion and a shell that's nearly full 'wants' a full shell to become an ion |
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Structure , properties & an example of ionic compounds |
-always have giant ionic lattices -the ions form a closely packed regular lattice arrangement -there are very strong electrostatic forces of attraction between oppositely charged ions in all directions -high m.p & high b.p due to strong attraction between the ions (it takes a large amount of energy to overcome this attraction) -when ionic compounds melt, the ions are free to move and they'll carry electric current -dissolve easily in water, the ions separate and are all free to move in the solution, so they'll carry electric current |
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Info on ions |
-charged particles -electronic structure of a noble gas -elements that most readily form ions are those in groups 1,2,6 and 7 -group 1 &2 elements are metals and lose electrons to form positive ions |
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Front (Term) See quizlet |
Back (Definition) See quiz let |
