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C4

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Flashcards do conjunto (6)

1IsotopesElements with the same number of protons but a different number of neutrons. e.g carbon 14 and 12
2what happens when the number of electrons are different to the number of protons.There will be an overall charge. A charged atom is called an ion.
3The history of the atomic theory400BC- Demcrites decribed the atom
1803- J.Dalton made the billiard model.
1897- J.J Thomson discovered the electrons.
1909- Geiger and Marsden discovered the nucleus.
1911- Rutherford said that the electron orbited the atom's nucleus.
1913- Bohr said electrons held enery packets called quanta.
4Why are ions formed?So the atoms both have a stable electronic structure just like noble gases. e.g neon and helium.
5What is the structure chloride?A giant ionic lattice where oppositely charged ions have a strong electrostactic attraction.
6Why does magnesium oxide have a higher boiling/melting point than sodium chloride?Because magnesium has to give away 2 electrons whereas sodium only has to give 1 away also magnesium ions are very small in radius so they get closer to the oxygen ion. Lastly Mg2+ and O2- have more charges so they form stronger ionic bonds.