Atoms Practice Exam Question 1

The video tutorial explains the basic concepts of atomic structure, focusing on protons, electrons, and neutrons. It details how to determine the number of these particles in Potassium and Argon using atomic and mass numbers. The tutorial also covers how to draw electronic configurations using dot and cross diagrams, highlighting the capacity of electron shells.

What is the atomic number of Argon?

• 17

• 18

• 19

• 20

How many electrons does Potassium have?

• 20

• 21

• 19

• 18

If the mass number of Potassium is 39 and it has 19 protons, how many neutrons does it have?

• 19

• 21

• 18

• 20

What is the mass number of Argon if it has 18 protons and 22 neutrons?

• 38

• 39

• 40

• 41

How many electrons are in the third shell of Argon?

• 8

• 7

• 6

• 9