Isotope Calculations in Chemistry

What do isotopes of an element have in common?

• Same number of neutrons

• Same number of protons

• Same number of electrons

• Same mass number

How many protons does chlorine have?

• 18

• 20

• 17

• 35

What is the mass number of chlorine-35?

• 18

• 37

• 35

• 17

How many neutrons are in chlorine-37?

• 18

• 17

• 37

• 20

What is the atomic number of lithium?

• 7

• 6

• 4

• 3

How many stable isotopic forms does lithium have?

• Two

• One

• Four

• Three

How many neutrons does the isotope Li-6 have?

• 7

• 6

• 4

• 3

What is the mass number of Li-7?

• 7

• 4

• 6

• 3

How do you calculate the mass number of an isotope?

• Number of protons plus number of neutrons

• Number of protons minus number of neutrons

• Number of neutrons minus number of protons

• Number of electrons plus number of neutrons