Atomic Structure Review

Ahhh...QUIZ REVIEW!

Thursday 11/19/2020

Atomic Number

the number of protons in an atom

Multiple Choice

What is the atomic number of Sulfur?

• 32

• 16

Multiple Choice

How many protons are in a Barium atom?

• 56

• 137

In a NEUTRAL ATOM

the number of PROTONS = the number of ELECTRONS

Multiple Choice

How many TOTAL electrons are in a neutral Selenium atom?

• 34

• 78

Multiple Choice

How many TOTAL electrons are in a neutral Calcium atom?

• 40

• 20

Mass Number

The number after the element name/symbol in an isotope name.

Example: Mg-27

Mass Number = 27

Multiple Choice

What is the mass number of N-16?

• 7

• 14

• 16

Finding the number of NEUTRONS

You must do some math!!

(Mass #) - (# of protons) = NUMBER OF NEUTRONS

Mg-27

Mass # = 27

# protons = 12

27-12 = 15 NEUTRONS

Multiple Choice

How many neutrons are in Hg-202?

• 80

• 122

• 202

Multiple Choice

How many NEUTRONS are in Ga-73?

• 73

• 31

• 42

MOST COMMON ISOTOPE

Round the atomic mass from the Periodic Table

to the nearest whole number

Atomic Mass of Lithium = 6.94 rounded = 7

Most common isotope: Li-7

Atomic Mass of Neon = 20.18 rounded = 20

Most common isotope: Ne-20

Multiple Choice

What is the most common isotope of Boron?

• B-5

• B-10

• B-11

Multiple Choice

What is the most common isotope of Palladium?

• Pd-106

• Pd-107

• Pd-46

Finding the Number of Neutrons in the Most Common Isotope

• Most common isotope of Nickel?

• Ni-59

• Mass Number - Protons = NEUTRONS

• 59-28= 31 NEUTRONS

Multiple Choice

How many NEUTRONS are in the MOST COMMON ISOTOPE of Arsenic?

• 75

• 42

• 33

• 5

Multiple Choice

How many NEUTRONS are in the MOST COMMON ISOTOPE of Xenon?

• 77

• 54

• 78

• 131

Bohr Model

• diagram of an atom that shows the electrons in shells (rings) around the nucleus

• count the number of electrons to determine the name of the atom

• This atom has 8 total electrons (green dots) since electrons = protons in a neutral atom and protons = Atomic #, this is a Bohr model of Oxygen.

Multiple Choice

What is the name of this atom (element)? *Use the Periodic Table

• Helium

• Beryllium

• Lithium

Multiple Choice

What is the name of this atom (element)? *Use the Periodic Table

• Hafnium

• Hydrogen

• Helium

Valence Electrons

• Electrons in the OUTERMOST shell of an atom

• This atom has 6 VALENCE ELECTRONS in the outermost shell.

Valence Electrons

• Using the Periodic Table, we can find the number of valence electrons in an atom.

• This atom has 5 valence electrons.

Multiple Choice

How many VALENCE ELECTRONS are in a neutral Potassium atom?

• 2

• 8

• 1

Multiple Choice

How many VALENCE ELECTRONS are in this atom?

• 2

• 8

• 10

Multiple Choice

What is the name of this atom?

• Neon

• Chlorine

• Oxygen

Multiple Choice

How many VALENCE ELECTRONS are in this atom?

• 7

• 9

• 10

Multiple Choice

What is the name of this atom?

• Nitrogen

• Oxygen

• Fluorine

Electron Dot Structures

Show the number of valence electrons as DOTS around the element symbol

Multiple Choice

How many VALENCE ELECTRONS are in a neutral Carbon atom?

• 6

• 12

• 4

• 2

Multiple Choice

How many VALENCE ELECTRONS are in a neutral Lithium atom?

• 1

• 3

• 7

• 2

Any Questions?