atomic structure

Question 1

features of alpha particles

Answer 1

two neutrons,(helium nucleus)
low penetration power

stopped by paper

very ionising

Question 2

gamma ray feature

Answer 2

EM radiation
High penetration power

stopped by lead

weakly ionising

Question 3

beta particle feautures

Answer 3

electron released by nucleus

moderate penetration power

stopped by aluminium

moderately ionising

for each beta particles a neutron in the ulcers has turned to a proton