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what does the mass number tell you
the total number or protons and neutrons
what does the atomic number tell us
how many protons there are
atoms of the same element all have the same number of protons , so atoms of different elements will have different numbers of protons
how do we find out the number of neutrons
we just subtract the atomic number from the mass number . electrons arent counted in the mass number because thier relative mass is very small
how do we find out the number of electrons in an atom
this is equal to the number of protons
how many protons , nuetrons and electrons does this structure have , what is the electonic structure , and what group is this element in and why
protons = 11
nuetrons = 23-11 = 12
electrons = 11
electronic structure = 2 , 8 , 1
group 1 because it has 1 electron in its outer most shell
Author
ghoran
ID
143182
Card Set
GCSE chemistry
Description
revision
Updated
2012-03-22T19:13:49Z
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