Section 7.3- Quantum Numbers and Electron Configuration

Question 1

drawn as 3D around the region that includes 90% of the dots

Answer 1

probability contour

Question 2

the compete arrangement of electron in an atom is the atom’s

Answer 2

electron configuration

Question 3

the Schrodinger equations allow scientists to describe any electron in an atom using four

Answer 3

quantum numbers

Question 4

the four quantum numbers describe the

Answer 4

1. electron’s shell or energy level
2. the shape of its orbital
3. the orientation of its orbital in space
4. its spin

Question 5

the first quantum number is known as the

Answer 5

principle quantum number (n)

Question 6

the principle quantum number describes the

Answer 6

electron shell (main energy level)

Question 7

the maximum number of electrons in an electron shell is

Answer 7

2n(squared)

Question 8

in general, as the value of n becomes larger, so do the following

Answer 8

1. the energy of an electron in that shell
2. the electron’s most probable distance from the nucleus
3. the number of electrons possible
4. the size of the electron cloud

Question 9

each shell is made up of closely grouped

Answer 9

subshells

Question 10

the second quantum number indicated the shape or type of subshell in which an electron is found and is therefore called the

Answer 10

subshell quantum number (l)

Question 11

determines SHAPE of orbital

Answer 11

SUBSHELL

Question 12

possible subshell shapes

Answer 12

s= spheres
p = dumbbells
d= clover leaves
f= double clover leaves

Question 13

in atoms with two or more electrons, the energy of each electron also depends on

Answer 13

l (subshell quantum number)

Question 14

the number of orbitals is limited to the

Answer 14

energy level

Question 15

the number of possible subshells in a particular shell equals the

Answer 15

principle quantum number

Question 16

the third quantum number needed to describe an electron is the

Answer 16

magnetic quantum number (ml)

Question 17

the magnetic quantum number describes the _______________________ of an individual orbital within a subshell

Answer 17

orientation in space

Question 18

the city, street, and house number are all necessary to locate where a person lives, just as ___ _________ and ______ are necessary to describe the orbital of an electron

Answer 18

n
l
m

Question 19

each orbital is occupied by a maximum of ___________ electrons

Answer 19

two

Question 20

the spin of an electron is described by the fourth quantum number

Answer 20

spin quantum number (ms)

Question 21

since there are two possible directions of spin - counterclockwise and clockwise- there are two value for ms:

Answer 21

positive 1/2
negative 1/2

Question 22

two electrons in any given orbital must have opposite spins and thus opposite values for the spin quantum number making such electrons

Answer 22

paired

Question 23

states that no two electrons in an atom may have the same set of four quantum numbers

Answer 23

Pauli exclusion principle

Question 24

rule that states that electrons occupy the lowest-energy orbital available, filling in orbitals of successively higher energies until all the electrons are distributed

Answer 24

aufbau principle

Question 25

rule that states that when a p, d, or f subshell is being filled, one electron will occupy each orbital in that subshell before pairing begins

Answer 25

Hund’s rule

Question 26

only ___________ electrons can occupy one orbital

Answer 26

two

Question 27

in the electron configurations of neutral atoms in their ground state, there are the same number of ___________ and _________________________

Answer 27

protons and electrons

Question 28

maximum number of subshells a shell can have

Answer 28

the same number of subshells as corresponding energy level
(level 1- s
level 2- s p
level 3- s p d
level 4- s p d f )

Question 29

the outermost electrons are the

Answer 29

valence electrons

Question 30

there can be a maximum of ____________ valence electrons

Answer 30

8

Question 31

it is often simpler and more instructive to represent these outer-energy-level electrons as dots written around the symbol for the element; such a symbol is known as a

Answer 31

Lewis symbol or electron-dot formula

Question 32

the maximum amount of electrons that exist in an orbital

Answer 32

two

Question 33

the maximum amount of electrons that exist in a energy level

Answer 33

2n squared

Question 34

the maximum amount of electrons that exist in a subshell

Answer 34

number of orientations x 2

Question 35

make the assumption that all inner elements have _____________ valence electrons

Answer 35

two

Question 36

the use of all the quantum numbers together to give us the arrangement of all the electrons in an atom

Answer 36

electron configuration

Question 37

use to represent the outermost shell of an electron

Answer 37

Lewis symbol