structure of atoms:
the nucleus is in the middle of the atom-it contains protons and neautrons-overall positive charge-whole mass is concentrated in the nucleus-tiny compared to atom.
the electrons move around the nucleus- negative charge- tiny compare to nucleus-size of orbit determins how big they are- virtually no mass- occupy shells around nucleus.
the number of protons is equal to the number of electrons as neutral atoms have no charge- but the charge of the electrons is the same size as the charge on protons but opposite- number of protons is always equal to number of electrons in an atom- the number of neutrons isn't fixed but about the same as the number of protons.
know your particals:
protons are heavy and positivly charged
neutrons are heavy and neutral
electrons are tiny and negitivley charged
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