Understanding Atomic Structure

What does the atomic number of an element represent?

• The charge of the element

• The number of electrons

• The number of protons

• The total number of protons and neutrons

How do you calculate the number of neutrons in an element?

• Add the charge to the mass number

• Subtract the charge from the atomic number

• Add the atomic number to the mass number

• Subtract the atomic number from the mass number

In the example of chlorine, what is the number of electrons if there is no charge?

• 17

• 20

• 37

• 0

For an ion with a -2 charge, how do you determine the number of electrons?

• Multiply the charge by the atomic number

• Subtract the charge from the atomic number

• Divide the atomic number by the charge

• Add the charge to the atomic number

If an element's atomic number is not given, how can you find it?

• By adding the mass number to the charge

• By guessing based on the element's name

• By looking it up in the periodic table

• By subtracting the mass number from the charge