Unit 3 Chemistry: The Electron

Question 1

How electrons are distributed within an atom:

Answer 1

Electron configurations

Question 2

Describes the average distance of an electron from the nucleus

Answer 2

Principal energy levels

Question 3

Correspond to the different areas an electron can be located in an atom:

Answer 3

Sublevels

Question 4

S sublevel shape

Answer 4

Spherical

Question 5

P sublevel shape

Answer 5

Dumbbell

Question 6

D sublevel shape

Answer 6

Clover

Question 7

F sublevel shape

Answer 7

Double clover

Question 8

What are sublevels represented by?

Answer 8

Letters: s, p, d, f, g, h…

Question 9

Each sublevel is oriented differently inv 3-D space and each orientation is called….

Answer 9

An atomic orbital

Question 10

How many electrons can atomic orbitals hold?

Answer 10

Only 2

Question 11

What are the principal energy levels?

Answer 11

n= 1, 2, 3, 4, etc.

Question 12

How many orbitals are in each type of sublevel?

Answer 12

s=1
p=3
d=5
f=7

Question 13

Electrons enter sublevels with the lowest energy first.

Answer 13

Aufbau Principle

Question 14

Uses circles to represent atomic orbitals with a label underneath to indicate sublevel and energy level.

Answer 14

Orbital notation

Question 15

Atomic orbitals can hold only two electrons at most and they must have opposite spin.

Answer 15

Pauli Principle

Question 16

In a sublevel with more than one orbital, put one electron into each orbital before putting 2e- into any one orbital.

Answer 16

Hund’s rule

Question 17

Order of energy levels:

Answer 17

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p

Question 18

Electrons that are located in the outermost energy level.

Answer 18

Valence electrons

Question 19

Used to describe the distribution of electrons in atoms.

Answer 19

Quantum numbers

Question 20

What does n=

Answer 20

Principal quantum number

Question 21

What does l=

Answer 21

Angular momentum quantum

Question 22

What does ml=

Answer 22

Magnetic quantum number

Question 23

What does ms=

Answer 23

Electron spin quantum number

Question 24

Described as the average distance of electrons to the nucleus (energy level0

Answer 24

Principal quantum number

Question 25

The shape of the orbitals (sublevel)

Answer 25

Angular momentum quantum number

Question 26

Orientation of the orbital in 3-D space (orbital)

Answer 26

Magnetic quantum number

Question 27

Electrons spin in two directions only, always valued at +1/2 and -1/2

Answer 27

Electron spin quantum number

Question 28

+1/2 means:

Answer 28

Up spin

Question 29

-1/2 means:

Answer 29

Down spin

Question 30

The energy level is the…

Answer 30

Valence shell

Question 31

If two atoms have the same number of electrons, they are said to be…

Answer 31

Isoelectronic