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( i ) and protons.
( ii ) protons and .
( ii ) age = years .
( i )
( ii ) The number of and the number of electrons is not ,so the do not cancel out.
( iii ) protons, but a different number of .
( i ) number =
( i ) particles will be by air after travelling a .
( ii ) Not all of the emitted from the will pass through the .
( iv ) Only the particles that are enough to the are back.
only a few are back by a large amount.
the nucleus in the is .
Both atoms contain and 1 proton.
and protons carry charges,so the charged electron and the charged proton each other out.
The have no charge.
( a ) atomic 15, atomic number
( i ) Proton number =
( ii ) nucleon number =
Isotopes are of the element with numbers of .
( i ) number of electrons =
( ii ) number of neutrons =
( i ) number of atoms = x 10 ^ 7 .