Mass Number and Isotopes Concepts

The video tutorial explains how to find the mass number of an element, which is the sum of protons and neutrons. It uses carbon as an example, highlighting that the atomic number is determined by the number of protons, which remains constant for a given element. The video also introduces isotopes, which are variations of elements with different numbers of neutrons, and explains how the average atomic mass is calculated based on isotopic abundance. The tutorial provides examples to illustrate these concepts, focusing on carbon isotopes like carbon-12, carbon-13, and carbon-14.

What is the mass number of an element with 6 protons and 6 neutrons?

• 18

• 24

• 12

• 6

If an element has 6 protons and 8 neutrons, what is its mass number?

• 16

• 14

• 12

• 18

What does the atomic number of an element represent?

• Average atomic mass

• Mass number

• Number of protons

• Number of neutrons

Which element is defined by having 6 protons?

• Helium

• Carbon

• Nitrogen

• Oxygen

What is the mass number of carbon with 7 neutrons?

• 14

• 13

• 15

• 12

What are isotopes?

• Elements with the same number of protons but different neutrons

• Elements with the same number of neutrons but different protons

• Elements with the same atomic mass

• Elements with the same mass number

What is the isotope of carbon with 8 neutrons called?

• Carbon-12

• Carbon-13

• Carbon-14

• Carbon-15

Why is the average atomic mass not a whole number?

• It is a random number

• It is calculated from the atomic number

• It is based on the most common isotope

• It averages the mass of all isotopes

Which isotope of carbon is most abundant?

• Carbon-12

• Carbon-13

• Carbon-14

• Carbon-15

What does the average atomic mass depend on?

• The atomic number

• The abundance of each isotope

• The number of neutrons

• The number of protons