Elements, Isotopes & Relative Atomic Mass

What is an element?

A substance made up of one type of atom

Approximately how many different elements are there?

100

What is an isotope?

Different forms of the same element that have the same number of protons but different number of neutrons

Carbon-12 and Carbon-13 are isotopes of carbon. How do they differ?

Carbon-12 has 6 neutrons

Carbon-13 has 7 neutrons

What does relative atomic mass mean?

The average mass of all the isotopes of an element

What is the formula for relative atomic mass?

(sum of isotope mass x total isotope abundance) ÷ 100

What is an element’s symbol?

One or two letter abbreviation for an element’s name

What is Hydrogen’s symbol?

H

What is Sodium’s symbol?

Na