elements/ isotopes

Question 1

how many elements are there ?

Answer 1

• around 100 different elements

Question 2

what is an element ?

Answer 2

• a substance which cannot be broken down into anything simpler

Question 3

what is an isotope ?

Answer 3

• different forms of the same element, that have the same number of protons but a different number of neutrons

Question 4

what is the relative atomic mass ?

Answer 4

• the average mass of all the isotopes that make up an element

Question 5

what is the equation for relative atomic mass ?

Answer 5

• sum of ( isotope abundance x isotope mass ) divided by the sum of abundance of all isotopes