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(% of isotope A x mass of isotope A) + (% of isotope B x mass of isotope B)
100
Relative atomic mass calculation
2
Number of electrons in the 1st shell
8
Number of electrons in the 2nd shell
group number = number of electrons in the outermost shell
How group number relates to the number of electrons in the outermost shell
number of electrons in 1st shell, number of electrons in 2nd shell etc
how to show electron configuration