1.2. Atomic Orbitals, Electronic Configurations and the Periodic Table Flashcards
The lines in atomic emission spectra of elements with +1 electrons can be explain if electrons have…
wave particle duality.
What does quantised mean?
Only able to hold a fixed amount of energy.
What is an orbital?
Where an electron is likely to be found in an energy level.
What does the principal quantum number refer to?
An electron’s energy level.
What does the angular momentum quantum number refer to?
What kind of orbital it is. s = 0, p = 1, d = 2, f = 3.
What does the magnetic quantum number refer to?
What specific orbital is it. s=0, p = -1, 0, 1. d = -2, -1, 0, 1, 2. f = -3,-2,-1,0,1,2,3.
What does the spin quantum number refer to?
An electrons spin direction. 1/2 or -1/2.
What does degenerate mean?
Of the same energy.
What is the Pauli Exclusion Principle?
No two electrons in the same atom can have the same four quantum numbers.
What is the Aufbau Principle?
Electrons fill orbitals in increasing energy.
What is Hund’s Rule?
When degenerate orbitals are available, electrons fill each degenerate orbital singly with parallel spins before pairing them up with opposite spins.
What is the electronic configuration of Titanium? Atomic no. 22.
1s2 2s2 2p6 3s2 3p6 3d2 4s2
Why do some elements have half-filled 4s shells and half filled 3d shells?
To keep the atom in its most stable state possible. Half-filled orbitals are more stable than unfilled or partially filled. Ionisation energy will be affected by this too.
