Atomic Structure Flashcards
1
Q
What is a molecule?
A
A group of atoms bonded together
2
Q
What is the atomic number?
A
The number of protons in the nucleus of an atom
3
Q
What is the mass number?
A
The total of the protons and neutrons (top number)
4
Q
What is an isotope?
A
Different atomic forms of the same element which have the same number of protons but different numbers of electrons
5
Q
What is the RFM/Ar?
A
The average mass of atoms of an element
6
Q
Calculate Ar from isotopic abundances
A
Multiply mass of each isotope by its abundance. Add those together and divide by the sum of the abundances.
E.g.
(35 x 75) + (37 x 25) / (75+25) = 35.5
