Given that #"atomic numbers, Z"#, and numbers of neutrons are integral, why do we get non-integral atomic masses? What is the relationship between #Z#, and the number of electrons?
And of course
The atomic mass is the weighted average of the individual isotopes that characterize the neutral element; for the heavier elements there is usually an isotopic mix. The position of the element in the Table flags the type of element we are dealing with: alkali metal or alkaline earth metal;