Matter Exam Question 1

The video tutorial explains the basic concepts of atomic particles, focusing on protons, electrons, and neutrons. It covers how to determine the number of protons and electrons in potassium and argon using atomic numbers. The tutorial also demonstrates how to calculate the number of neutrons using the mass number. Finally, it guides viewers on drawing dot and cross diagrams to represent the electronic configuration of these elements.

What is the relationship between the atomic number and the number of protons in an atom?

• The atomic number is double the number of protons.

• The atomic number is equal to the number of protons.

• The atomic number is half the number of protons.

• The atomic number is unrelated to the number of protons.

How many neutrons are present in an atom of potassium with a mass number of 39?

• 21

• 20

• 19

• 18

If argon has a mass number of 40 and 18 protons, how many neutrons does it have?

• 21

• 23

• 20

• 22

How many electrons can the first shell of an atom hold?

• 2

• 4

• 1

• 8

What is the electronic configuration of potassium?

• 2, 8, 8

• 2, 8, 8, 1

• 2, 8, 9

• 2, 8, 7, 2