stomic structure

Question 1

isotoope

Answer 1

is an element with the same number of protons but different number of neutronsthey have the same atomic number but different mass number

Question 2

what happe4ns when isotopes unstable

Answer 2

result in decay and give out radiation, ionising radiation that canknock electron off atoms

Question 3

alpha

Answer 3

alpha particle emmitted from nucleus of radioatic nuclei it is made from two protons and two neutrons they are the least penetrating stopped by skin and paper

Question 4

beta

Answer 4

radiation fast moving electron that canbe stoped by peice of aluminium beta radiated is emmited from a atom when a neutron splits into proton and an electron

Question 5

gamma

Answer 5

wave of radiation most penetrating stopped by thick lead and concrete but least ionising

Question 6

half life

Answer 6

time taken for number of radioactive nuclei will deczy measured in becquerels one decay per second

Question 7

irradiation

Answer 7

occurs when material are near radiocative source somewtimesplaced inside lead lined box to avoidthis