**CH4 (Quantum Theory) Flashcards
Quantum numbers are used to differentiate between _______.
electrons
In quantum theory, each electron in an atom is assigned a set of ____ quantum numbers.
four
Three of four quantum numbers that are assigned for each electron in an atom, give the ________ of the electron.
location
the fourth of four quantum numbers assigned to each electron in an atom gives the _________ of the electron within the orbital.
orientation
What are the four quantum numbers?
n, l, ml, and ms.
n (1,2,3,4) is the _______ quantum number.
principal
______ (n-1) is the angular momentum quantum number.
l
when n=1, l will be? and when n=2, l will be?
0, 0 or 1
Name the orbital: when l=0, l=1, l=2, l=3?
0 is the s orbital, 1 is the p orbital, 2 is the d orbital, 3 is f orbital
In other words, l is the _____ of the “volume” of the space that the electron occupies.
shape
ml is the ______ quantum number
magnetic
_____ is the orientation of the orbital in space.
ml
T or F: the number of orbitals depends on ml.
true, so when l=2 then, ml=-2 -1 0 1 2 and so the number of oribtals are 5
ms is the _____ quantum number.
spin
ms = ________ when the direction of the spin is from N–>S or ______ when it is from S–>N
+1/2, -1/2
T or F: Existence (and energy) of electron in atoms is described by its unique wave function
true
_________ states that no two electrons in an atom can have the same four quantum numbers.
pauli exclusion principle
________ is where electrons have the same value of n.
shell
_______ is where electrons have the same vlaues of n and l.
subshell
_______ is where electrons have the same values of n, l, and ml.
orbital
T or F: An orbital can hold 4 electrons.
false, 2 electrons
how many 2p orbitals are there in an atom?
3 orbitals
______ electrons can be placed in the 3d subshell.
10
T or F: Energy of orbitals in a single electron atom only depends on principal quantum number n.
true
Energy of orbitals in a multi-electron atom depends on ____ and ____.
n, l
In aufbau principle, you “fill up” electrons in (lowest/highest) orbitals.
lowest
_________ states that the most stable arrangement of electrons in subshells is the one with the greatest number of parallel spins.
Hund’s rule
______ is how electrons are distributed among the various atomic orbitals in an atom.
electron configuration
What is the electron configuration of Mg (12 electrons)?
1s2, 2s2, 3p6, 3s2
what are the possible quantum numbers for the last (outermost) electron in Cl (17 electrons)?
3s23p5
