GCSE chemistry

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

143182

Card Set

GCSE chemistry

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revision

Updated

2012-03-22T19:13:49Z

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