**CH4 (Quantum Theory)

Question 1

Quantum numbers are used to differentiate between _______.

Answer 1

electrons

Question 2

In quantum theory, each electron in an atom is assigned a set of ____ quantum numbers.

Answer 2

four

Question 3

Three of four quantum numbers that are assigned for each electron in an atom, give the ________ of the electron.

Answer 3

location

Question 4

the fourth of four quantum numbers assigned to each electron in an atom gives the _________ of the electron within the orbital.

Answer 4

orientation

Question 5

What are the four quantum numbers?

Answer 5

n, l, ml, and ms.

Question 6

n (1,2,3,4) is the _______ quantum number.

Answer 6

principal

Question 7

______ (n-1) is the angular momentum quantum number.

Answer 7

l

Question 8

when n=1, l will be? and when n=2, l will be?

Answer 8

0, 0 or 1

Question 9

Name the orbital: when l=0, l=1, l=2, l=3?

Answer 9

0 is the s orbital, 1 is the p orbital, 2 is the d orbital, 3 is f orbital

Question 10

In other words, l is the _____ of the “volume” of the space that the electron occupies.

Answer 10

shape

Question 11

ml is the ______ quantum number

Answer 11

magnetic

Question 12

_____ is the orientation of the orbital in space.

Answer 12

ml

Question 13

T or F: the number of orbitals depends on ml.

Answer 13

true, so when l=2 then, ml=-2 -1 0 1 2 and so the number of oribtals are 5

Question 14

ms is the _____ quantum number.

Answer 14

spin

Question 15

ms = ________ when the direction of the spin is from N–>S or ______ when it is from S–>N

Answer 15

+1/2, -1/2

Question 16

T or F: Existence (and energy) of electron in atoms is described by its unique wave function

Answer 16

true

Question 17

_________ states that no two electrons in an atom can have the same four quantum numbers.

Answer 17

pauli exclusion principle

Question 18

________ is where electrons have the same value of n.

Answer 18

shell

Question 19

_______ is where electrons have the same vlaues of n and l.

Answer 19

subshell

Question 20

_______ is where electrons have the same values of n, l, and ml.

Answer 20

orbital

Question 21

T or F: An orbital can hold 4 electrons.

Answer 21

false, 2 electrons

Question 22

how many 2p orbitals are there in an atom?

Answer 22

3 orbitals

Question 23

______ electrons can be placed in the 3d subshell.

Answer 23

10

Question 24

T or F: Energy of orbitals in a single electron atom only depends on principal quantum number n.

Answer 24

true

Question 25

Energy of orbitals in a multi-electron atom depends on ____ and ____.

Answer 25

n, l

Question 26

In aufbau principle, you “fill up” electrons in (lowest/highest) orbitals.

Answer 26

lowest

Question 27

_________ states that the most stable arrangement of electrons in subshells is the one with the greatest number of parallel spins.

Answer 27

Hund’s rule

Question 28

______ is how electrons are distributed among the various atomic orbitals in an atom.

Answer 28

electron configuration

Question 29

What is the electron configuration of Mg (12 electrons)?

Answer 29

1s2, 2s2, 3p6, 3s2

Question 30

what are the possible quantum numbers for the last (outermost) electron in Cl (17 electrons)?

Answer 30

3s23p5