Electronic configuration of the elements Flashcards
1
Q
Electron shells model name
A
- (Bohr model) labelled K, L, M, N or 1, 2, 3, 4
2
Q
Electron arrangement
(K, L, M, N)
A
- K shell holds 2 electrons
- L shell holds 8 electrons
- M shell holds 18 electrons
- N shell holds 32 electrons
- can hold more than 8 but for stability they don’t
3
Q
Atomic number
A
number of protons / number of electrons
4
Q
Neutrons =
A
mass number - atomic number
4
Q
Mass number
A
number of protons + number of neutrons
(in the nucleus, neutrons balance out the mass)
5
Q
what is ground state
A
- electrons prefer to be at the lowest energy level as it is the most stable
6
Q
when do electrons move to excited states
A
when electrons absorb more energy, they move to an excited state
7
Q
what are the electron shells associated with
A
each shell is associated with an energy level
(closest to the nucleus is the lowest)
8
Q
where do electrons fill first
A
electrons fill lowest energy level first
