A sample of sodium has a relative abundance of 75% with a mass number of 23, a relative abundance of 20% with a mass number of 22 and a relative abundance of 5% with a mass number of 24. What is the average atomic mass?

The average atomic mass of Sodium : 22.85

The elements in nature have several types of isotopes

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.

So Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

Mass atom X = mass isotope 1 . % + mass isotope 2.% + ....

isotope 1 : 75%, mass number = 23

Isotope 2 : 20%, mass number = 22

Isotope 3 : 5%, mass number = 24

The average atomic mass :

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error