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element compounds and mixture (electrons (8 electrons at the last shell…
element compounds and mixture
element
a substance made entirely of one type of atom
the number of protons is what makes one element different from another
number of protons is the atomic number
compound
a substance that contains atoms of different elements that are chemically joined together
joined together by bonds
always exist as molecules
mixture
made form molecules of elements and compounds that are mixed together with no chemical bond.
seperating compounds fromm mixtures
chromotography
dissolved substances that has different colours
electrons
shell closest to the nucleus : not more than 2
maximun 8 electrons from second shell onwards
same num electron at the last shell
same chemical properties
8 electrons at the last shell
cannot transfer any electrons , very stable
elements without full shell reacts to be complete
react with each other to share electrons to become more stable
preriodic trends
atomic radius increases as it goes down
more reactive
more unstable
cannot attract well with protons