Module 2-Foundations in Chemistry Flashcards
1
Q
define relative atomic mass
A
the weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12
2
Q
define relative isotopic mass
A
the mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12
3
Q
How to calculate relative atomic mass
A
mass of isotope*abundance
divide by 100
round
4
Q
Name scientists in order of their discoveries regarding the atom
A
Democritus
Dalton
J.J. Thomson-discovers electrons
Rutherford-gold leaf experiment
Niels Bohr
Rutherford discovers proton
Chadwick discovers neutron
5
Q
define atomic number
A
number of protons
6
Q
define mass number
A
number of neutrons and protons
