An atom is made out of:
- Protons; mass = 1; charge - +1
- Neutrons; mass = 2; charge - 0
- Electrons; mass = 1/1840; charge - -1
ISOTOPES - are atoms with the same atomic number but different mass number, this is because there is a different amount of neutrons.
Isotope may differ in physical properties (mass, density, rate of diffusion etc) and radioactivity but not generally in chemical properties.
Radioisotopes are radioactive isotopes. they are used for:
- Carbon-14 in radiocarbon dating,
- Co-60 in radiotherapy
- Iodine-131 and Iodine-125 as medical tracers.
RELATIVE ATOMIC MASS: the average of the atomic masses of each isotope multiplied by the isotopes abundance.
RAM = [(mass of Isotope 1 x abundance of Isotope 1) + (mass of Isotope 2 x abundance of isotope 2)] / 100
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