CHEMISTRY - Matter - Atomic Number & Mass Number

The video tutorial explains the concepts of atomic and mass numbers in elements. The atomic number, denoted by Z, represents the number of protons in an atom and is unique to each element. The mass number, denoted by A, is the sum of protons and neutrons in an atom. The tutorial provides examples using hydrogen, oxygen, and lithium to illustrate how to calculate the number of neutrons by subtracting the atomic number from the mass number. The video emphasizes the importance of understanding these numbers for identifying and differentiating elements.

Provide an example of an element and explain its atomic and mass numbers.

How many neutrons does lithium have if its mass number is 7 and it has 3 protons?