Understanding Atomic Structure Concepts

Mr. Shaw introduces the periodic table as a tool for chemists, explaining its structure and how it helps distinguish elements by atomic number, which represents the number of protons. He discusses the mass number, which includes both protons and neutrons, and how to calculate the number of neutrons. The video also covers how to determine the number of electrons in neutral atoms, emphasizing that for neutral atoms, the number of electrons equals the number of protons. The session concludes with a review of these concepts to prepare students for future activities.

What is the primary purpose of the periodic table for chemists?

• To provide information about elements

• To build structures

• To decorate laboratories

• To cook food

What does the atomic number of an element represent?

• The number of electrons

• The number of protons

• The number of neutrons

• The total mass of the atom

If an element has an atomic number of 6, how many protons does it have?

• 6

• 12

• 9

• 3

How is the mass number of an atom calculated?

• By adding the number of protons and electrons

• By subtracting the number of neutrons from protons

• By subtracting the number of electrons from protons

• By adding the number of protons and neutrons

For carbon, if the mass number is 12 and the atomic number is 6, how many neutrons are present?

• 18

• 24

• 12

• 6

In a neutral atom, how does the number of electrons compare to the number of protons?

• There are more electrons than protons

• The number of electrons equals the number of protons

• There are fewer electrons than protons

• The number of electrons is double the number of protons

For a neutral carbon atom, how many electrons are present if the atomic number is 6?

• 9

• 12

• 6

• 3

What is the key takeaway about the number of protons in an element?

• It can change over time

• It is unique and constant for each element

• It is always equal to the number of neutrons

• It is always equal to the mass number

Which number on the periodic table is used to find the number of protons in an element?

• The electron number

• The atomic number

• The mass number

• The neutron number

What should you subtract from the mass number to find the number of neutrons?

• The number of protons and electrons

• The total number of particles

• The atomic number

• The number of electrons