APEMAN

APEMAN

How to figure out the number of protons, neutrons and electrons for any element using the periodic table.

APEMAN stands for

• A= Atomic number

• P= Protons

• E= Electrons

• M= Mass number

• -Atomic number=

• Neutrons

Multiple Choice

What does the A in APEMAN stand for?

• Atomic number

• atom

Multiple Choice

What does the P in APEMAN stand for?

• positive

• proton

Multiple Choice

What does the E in APEMAN stand for?

• electrons

• electricity

Multiple Choice

What number represents the protons for aluminum?

• 13

• 26.982

• 27

Multiple Choice

What number represents the electrons for aluminum?

• 13

• 26.982

• 27

APEMAN stands for

• A= Atomic number

• P= Protons

• E= Electrons

• M= Mass number

• -Atomic number=

• Neutrons

So, protons and electrons are the same as the atomic number.

Neutrons are trickier... you have to do a little fancy subtraction

• M stands for Mass number

• to find the mass number, take the atomic number and round it to the nearest whole number.

• 
  

• 
  

• 
  

Multiple Choice

What is the atomic mass of aluminum?

• 13

• 26.982

Multiple Choice

What is the mass number for aluminum?

• 13

• 26.982

• 27

So if the mass number for aluminum is 27, how do we find the neutrons?

• Mass number- Atomic number = Neutrons

• (M-A=N)

• So... 27-13= 14 neutrons!

Multiple Choice

Get it? That's APEMAN!

Try another one.

What is the number of protons in calcium?

• 20

• 40.078

• 40

Multiple Choice

Get it? That's APEMAN!

Try another one.

What is the number of electrons in calcium?

• 20

• 40.078

• 40

Multiple Choice

Get it? That's APEMAN!

Try another one.

What is the number of neutrons in calcium?

• 40-20=20

• 40.078- 20= 19.922

A couple of tips

• There are ways to check if your answer makes sense:

• Your answers will always be whole numbers

• protons and electrons will always be the same number

• neutrons for the first 20 elements will be close to or the same as the atomic number