Isotopes

Isotopes

Isotopes

• atoms with the SAME number of PROTONS but DIFFERENT number of NEUTRONS

Carbon 12

Consider the Atom Carbon, the atomic number tells us the number of protons.

How many protons in Carbon 12?

Multiple Choice

What is the correct definition for isotopes?

• atoms with the same number of protons and neutrons

• Atoms with the same number of protons but different number of neutrons

• Atoms with the same number of neutrons but different number of protons

• Atoms with no mass

Multiple Choice

• The atomic number indicates the number of neutrons

• The atomic number indicates the isotope number

• The atomic number indicates the number of protons

• The atomic number indicates the number of protons and neutrons

Multiple Choice

If you want to determine the total number of protons and neutrons in an atom, you can refer to the

• atomic mass

• atomic number

• symbol

• charge

Lithium isotopes

What do you notice with these 3 isotopes of Lithium?

Multiple Choice

What is the difference between these 3 Lithium isotopes?

• no difference

• they have the same atomic number

• they have the same mass number and atomic number

• they have different mass numbers

Fill in the Blank

atomic number = number of electrons = number of

Fill in the Blank

mass number = atomic number + number of

The atomic mass of an element is the weighted average of the masses of all its isotopes that occur naturally