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atomic structure

elements in the periodic table are measured in order of increasing atomic number

Electronic configuration

electrons are arranged in an orded fashion each shell can hold a maximum number of electrons

Rules Shell : maximum number of electrons

1: 2

2 : 8

3 : 8

isotopes and relative atomic mass

isotopes are atoms of the same element which have the same number of protons but different number of neutrons eg. ...............

relative atomic mass is the mass of the atoms of an element relative to ................

relative formula mass

The relative formula mass of the substance is the sum of the relative atomic masses of all the atoms present in the substances

Moles

the term mole is used to represent amount of substance

A mole of electrons, atoms, molecule etc. is the avogardo number which is 6.02x10...

Moles of atoms

m=mass in grams

n=number in moles

Ar=relative atomic mass