Because they are good at their professions
An ionic bond is formed between lithium and bromine.
They are called isotopes.
Example of isotopes are Hydrogen and deuterium.
Hydrogen is 1 proton and 0 neutrons.
Deuterium is 1 proton and 1 neutron
To know the density you also need to know the volume of the rock.
Result rocks poor what heat lave transmit
