lesson 2- isotopes

What is the relative atomic mass (RAM) (Ar) of an element?

It is an average value that takes account of the different masses and abundances (amounts) of all the isotopes of the element.

What is the formula for the relative atomic mass?

Relative atomic mass = sum of (isotope % abundance x isotope mass) divided by 100 (sum of abundance of all isotopes)

Describe the differences and similarities in terms of subatomic particles between the isotopes of: carbon-12 and carbon-13

Similarities are that both carbon-12 and carbon-13 have 6 protons and 6 electrons. The differences are that carbon-12 has 6 neutrons and carbon-13 has 7 neutrons.

What is an isotope?

Isotopes are atoms of the same elements that have different numbers of neutrons but the same number of protons and electrons.