Question

an element can have atoms with different mass no. but same chemical properties and some are also used in the field of medicine in the treatment of diseases?
1) what are such element known as?
2) define such element and also write one example?
3) which properties are different in them?

Answer 1

according to me
1.such type of elements are called isotope
2.isotopes are elements with same atomic no. and different atomic mass no.
e.g.o6 and o8
3.physical properties are different

Answer 2

1 . such elements are known as isotopes.
2 . isotopes are elements that have same atomic no but different mass no due different no of neutron.eg protium and deuterium are 2 isotopes of hydrogen.
3 . cobalt 60 is used in radiotherapy for treating cancer.