Atomic structure

Question 1

Atom

Answer 1

Smallest part of an element

Question 2

What is the structure of an atom

Answer 2

Nucleus = Protons and Neutrons
Shells = Electrons
Atoms are neutral as n(protons) = n(electrons)

Question 3

What are the relative masses and charges of sub-atomic particles

Answer 3

Proton: Charge +1, Mass 1
Neutron: Charge 0, Mass 1
Electron: Charge -1, Mass 0

Question 4

What is Atomic number

Answer 4

The number of protons in an atom
(Defines which element the atom is)

Question 5

What is Mass number

Answer 5

The number of Protons + Neutrons

Question 6

What is an isotope

Answer 6

Atoms of the same element with a different mass number
(same protons, diff. neutrons)

Question 7

What is Relative atomic mass

Answer 7

The average mass compared to 1/12th the mass of carbon-12

Question 8

How to calculate relative atomic mass

Answer 8

Multiply mass of each isotope by relative abundance
Add those together
Divide by sum of relative abundances (usually 100)
e.g. Ar = ((35 x 75) + (37 x 25)) / 100
Ar = 35.5

Question 9

What is electronic configuration

Answer 9

The number of electrons in each shell
e.g. 2,8,8