What the heck is an ELEMENT in chemistry?

The video tutorial explains the concept of elements, their definition, and examples like iron. It discusses isotopes, such as carbon-12 and carbon-14, and introduces the periodic table, highlighting atomic numbers and element symbols. The video also covers the abundance of elements like hydrogen and helium in the universe and the common elements in living organisms, such as hydrogen, carbon, nitrogen, and oxygen.

What are the most abundant elements in the world and their significance?

Identify the four most common elements found in living organisms.

How do elements like sodium chloride function in the human body?