Understanding Isotopes and Isotopic Notation

What is the defining characteristic of isotopes of the same element?

• Different number of protons

• Different atomic numbers

• Different number of neutrons

• Different number of electrons

How many protons do all carbon isotopes have?

• 6

• 7

• 8

• 5

What is the mass number of carbon-14?

• 14

• 13

• 12

• 15

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

• Divide the mass number by the atomic number

• Add the atomic number to the mass number

• Multiply the atomic number by the mass number

• Subtract the atomic number from the mass number

What does the average atomic mass of an element represent?

• The mass of the lightest isotope

• The mass of the heaviest isotope

• The mass of the most common isotope

• The weighted average mass of all isotopes

Which isotope of carbon is the most abundant in nature?

• Carbon-15

• Carbon-13

• Carbon-14

• Carbon-12

What is the atomic number of chlorine?

• 19

• 16

• 18

• 17

How many neutrons are in chlorine-35?

• 16

• 17

• 18

• 19

What is the isotopic notation for chlorine-37?

• Cl with 17 on top and 37 on bottom

• Cl with 35 on top and 17 on bottom

• Cl with 17 on top and 35 on bottom

• Cl with 37 on top and 17 on bottom

If an element has an atomic number of 17, what element is it?

• Argon

• Chlorine

• Bromine

• Fluorine