1.6 ; structure of an atom ✓

Question	Answer
What are the three sub-atomic particles of an atom?	1) proton 2) neutron 3) electrons
a) relative mass b) location c) charge -of each sub atomic particle?	proton: a) 1 ; b) nucleus ; c) +1 neutron: a) 1 ; b) nucleus ; c) 0 electron: a) 0 ; b) shells ; c) -1
Atoms contain an equal number of ____ and _____, so carry no overall _____.	Atoms contain an equal number of protons and electrons, so carry no overall charge.
atomic number = ...	atomic number = number of protons (=number of electrons)
mass number = ...	mass number = number of protons + neutrons
How do you work out the number of neutrons in an atom?	mass number - atomic number
Lead has an atomic number of 82, and a mass number of 207. Work out the number of: a) protons b) electrons c) neutrons	a) protons = atomic number = 82 b) electrons = atomic number = 82 c) neutrons = mass no. - atomic no. = 125

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