2&12. Atomic structure Flashcards
1
Q
Mass number
A
(A) = the total number of protons and neutrons.
2
Q
Atomic number
A
(Z) = the number of protons.
3
Q
Isotope
A
a version of an atom with the same number of protons but a different number of neutrons.
4
Q
Orbital
A
a region of space where an electron is most likely to be found.
5
Q
Pauli exclusion principle
A
no two electrons can have the same four electronic quantum numbers.
6
Q
Aufbau principle
A
electrons orbiting one or more atoms fill the lowest available energy levels before filling higher levels.
7
Q
Hund’s rule
A
every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.
