explain with examples 1 .atomic number 2. mass number 3. isotopes and 4.isobars .give any two uses of isotopes .
Answers
1. Atomic number
Atomic number is the number of protons present in that element.
eg; atomic number of hydrogen is 1 because it has only 1 proton.
2. mass number
mass number is the total mass of the atom i.e. number of protons + number of neutrons.
eg; mass number of helium is 4 because it has 2 protons and 2 neutrons.
3. isotopes
isotopes are elements with the same atomic number but different mass numbers.
eg; isotopes of ,hydrogen: protium (A = 1), deuterium (A = 2), and tritium (A = 3). where A is mass number
4. isobars
isobars are elements with different atomic number but same mass number.
eg; argon's atomic number is 18 whereas calcium's atomic number is 20, but both of them have mass number as 20 . so they are isobars.
2 uses of isotopes
- An isotope of Cobalt is used in the treatment of goitre.
- An isotope of Iodine is used in the treatment of cancer