Chemistry A: Unit 3 Atomic Structure and the Periodic Table Study Guide
Define the following:
Nucleus
Atom
Atomic mass
Atomic mass unit
Atomic number
Proton
Neutron
Electron
Mass number
Isotope
Which 2 subatomic particles are found in the nucleus?
Which scientist first came up with the idea of the atom?
Which scientist first arranged the elements according to nuclear charge?
How would you abbreviate the symbol for the isotope carbon-14?
Be able to determine the atomic number, atomic mass, number of electron, protons and neutrons.
Example:
Atomic number
Atomic mass
Protons
Electrons
neutrons
Potassium
Carbon-14
15
N
7
22
26
Be able to determine the average atomic mass of an element. Rubidium has 2 isotopes
84.91amu (72.16%) and 86.91amu (27.84%). Calculate the average atomic mass of rubidium.