Exploring Isotopes and Their Symbols

What defines an isotope of an element?

• Same number of protons and neutrons

• Different number of protons and neutrons

• Same number of protons but different number of neutrons

• Same number of neutrons but different number of protons

How many protons does nitrogen have?

• 6

• 8

• 7

• 9

What does the mass number of an isotope represent?

• Number of protons

• Number of neutrons

• Number of protons plus neutrons

• Number of electrons

How is the isotope carbon-14 written using symbols?

• 6-C

• C-6

• 14-C

• C-14

Tags

NGSS.HS-PS1-8

What is the atomic number of oxygen?

• 6

• 9

• 8

• 7

How many neutrons are in the isotope oxygen-16?

• 9

• 6

• 7

• 8

What is the mass number of the isotope zinc with 30 protons and 35 neutrons?

• 75

• 60

• 70

• 65

What does the average atomic mass on the periodic table represent?

• The mass of the most common isotope

• The sum of protons and neutrons

• The mass of the least common isotope

• A weighted average of all isotopes

Which isotope of copper is more abundant if the average atomic mass is closer to 63?

• Copper-64

• Copper-63

• Copper-62

• Copper-65

What is the first step in calculating the average atomic mass?

• Add the masses of all isotopes

• Divide by the number of isotopes

• Convert percentages to decimals

• Multiply mass by abundance