Understanding Isotopes and Atomic Structure

This video tutorial explains how to determine the number of protons, neutrons, and electrons in an atom using the periodic table. It covers the atomic number, mass number, and the concept of isotopes, providing examples with elements like sodium, silver, and carbon. The tutorial also discusses the relationship between protons and electrons in neutral atoms and how to calculate the number of neutrons. It concludes with practical applications and exercises to reinforce the learning.

What does the atomic number of an element represent?

• The number of electrons

• The mass number

• The number of protons

• The number of neutrons

For a neutral element, how do the number of protons and electrons compare?

• Protons are always more

• Electrons are always more

• They are equal

• It depends on the element

How is the mass number of an element calculated?

• Protons plus electrons

• Atomic number plus electrons

• Neutrons plus electrons

• Protons plus neutrons

What is the mass number of an element with 11 protons and 12 neutrons?

• 11

• 12

• 24

• 23

What defines an isotope of an element?

• Different number of electrons

• Different number of neutrons

• Different number of protons

• Different atomic number

Which of the following is an isotope of carbon?

• Carbon-15

• Carbon-12

• Carbon-18

• Carbon-10

What is the mass number of Carbon-14?

• 14

• 13

• 12

• 15

How many neutrons are in Carbon-13?

• 5

• 6

• 7

• 8

What is the atomic number of potassium?

• 18

• 19

• 21

• 20

If an element has an atomic number of 20 and a mass number of 40, how many neutrons does it have?

• 19

• 20

• 21

• 18