Atomic Structure

​Atomic Structure

Unit 3: Atomic Structure

Multiple Select

What are the three subatomic particles that make up an atom?

• Positrons

• Protons

• Neutrons

• Electrons

An atom is made up of 3 subatomic particles

Subatomic	Symbol​	​Location	​Charge	Mass​ (amu)
​proton	​p	​nucleus	​+1	1​
neutron​	​n	​nucleus	0​	​1
electron​	​e	​orbital	-1​	0​

Multiple Choice

How many elements are on the periodic table?

• 200

• 150

• 118

• 120

• Sum of the protons (atomic number) and neutrons

• Atoms with the same number of protons and different number of neutrons are isotopes

Mass Number

• The number of protons

• Tells you the identity of the atom (found in upper left corner of periodic table)

Atomic Number

How atoms differ

Multiple Choice

What element has the atomic number 39?

• Molybdenum (Mo)

• Strontium (Sr)

• Yttrium (Y)

• Zirconium (Zr)

Match

Match the following to their correct atomic number

• Al

• Br

• Na

• B

• Fe

13

35

11

5

26

• 13

• 35

• 11

• 5

• 26

Multiple Choice

An atom has 8 protons and 9 neutrons. What is the mass number?

• 16
• 17
• 18
• 15

Isotope Notation

Isotope Notation gives a summary of a specific isotope.

Mass Number

Atomic Number

Charge

Symbol

• Has more protons than electrons

• Called a CATION

Positively Charged

• Has more electrons than protons

• Called an ANION

Negatively Charge

Negative vs Positive vs Neutral

Hyphen Notation

The full name or symbol of the element - the mass number

Match

​ Match the following information regarding this isotope ​​

• Charge

• Mass #

• Atomic #

• Number of Neutrons

• Number of electrons

+2

56

26

30

24

• +2

• 56

• 26

• 30

• 24

Multiple Choice

If you knew the number of neutrons of an isotope and its mass number, what information could you figure out?

• Charge

• Number of electrons

• The number of protons

Multiple Choice

An atom has 4 protons, 5 neutrons, and 4 electrons. What is the atomic number?

• 0

• 9

• 5

• 4

Periodic Table

Information given on table:

• Found on the periodic table

• Is an AVERAGE of the mass number of multiple isotopes (will discuss later)

Atomic Weight

• Refers to ONE specific isotope

• Get by adding protons and neutrons (NOT found on periodic table)

Mass Number

Mass Number vs Atomic Weight

Labelling

Move the labels to the correct location on the box from the Periodic Table.

Drag labels to their correct position on the image

Atomic weight

Atomic Number

Isotope Charts

Fill in the blanks using the information provided. Good way to practice counting protons, neutrons, and electrons.