Atomic Expressions

Match the isotopes with the correct PEN numbers

• 12-12-12

• Aluminum - 25

• 12-12-11

• Sodium - 23

• 13-13-12

• Magnesium - 23

• 11-11-12

• Sodium - 24

• 11-11-13

• Magnesium - 24

Label the components of nuclear symbol/isotopic notation.

b

d

c

average atomic mass

atomic number

chemical symbol

mass number

Label the image.

b

c

neutrons only

protons, electrons, and neutrons

electrons only

protons and neutrons

protons only

Match the following atoms with the correct hyphen notation.

• Oxygen - 18

• 
• Neon - 20

• 
• Neon - 22

• 
• Oxygen - 17

• 
• Oxygen - 16

• 

Isotopes of a given element differ in the number of __________.

• electrons

• protons

• neutrons

• all of the above

What is the PEN number for this isotope?

• 37-37-30

• 30-30-67

• 30-30-37

• 30-47-47

What atom is this?

PEN number 14-14-16

• Sulfur - 30

• Sulfur - 16

• Silicon - 14

• Silicon - 30

What is the PEN number for this isotope?

Strontium - 90

• 90 - 38-38

• 38-38-50

• 38-38-51

• None of these are correct

Identify the atoms that are isotopes.

• A and E

• B and D

• B and C

• E and F

Which 2 different atoms have the same mass number?

• B and D

• B and F

• A and E

• E and F