Exploring Isotopes and Their Notation

What does the atomic number of an element represent?

• The number of electrons

• The mass number

• The number of protons

• The number of neutrons

What is the main difference between isotopes of the same element?

• Number of neutrons

• Number of electrons

• Atomic number

• Number of protons

Why are some isotopes radioactive?

• They have too many electrons

• They have a stable nucleus

• They have too many protons

• They have an unstable arrangement of neutrons

Tags

NGSS.HS-PS1-8

Which of the following is an application of radioactive isotopes?

• Soil testing

• Food irradiation

• Water purification

• Air filtration

Tags

NGSS.HS-PS1-8

How is lithium-6 represented in mass number notation?

• Li-3

• Li-6

• Li-7

• Li-9

In isotope notation, what is placed at the top?

• Number of electrons

• Mass number

• Number of protons

• Atomic number

What does the number 14 represent in carbon-14?

• Atomic number

• Number of protons

• Mass number

• Number of electrons

If an element has an atomic number of 6 and a mass number of 13, how many neutrons does it have?

• 6

• 7

• 13

• 19

Tags

NGSS.MS-PS1-1

For lithium with a mass number of 7, how many neutrons are present?

• 3

• 4

• 7

• 5

Calculate the number of neutrons in an isotope with a mass number of 238 and an atomic number of 92.

• 146

• 238

• 92

• 330

Tags

NGSS.HS-PS1-8