Understanding Atomic Numbers and Elements

The video tutorial explains how to find the atomic number for gold (Au) on the periodic table. It highlights that the atomic number is a whole number, usually above the element symbol, and equals the number of protons in the nucleus. The tutorial also distinguishes between atomic mass and atomic number, emphasizing that the atomic number increases by one across a row in the periodic table. Additionally, it explains that elements are neutral, meaning the number of protons equals the number of electrons. The video concludes with a summary and thanks to the viewers.

What is the atomic number of gold (Au) on the periodic table?

• 81

• 80

• 79

• 78

The atomic number of an element is equal to the number of which subatomic particle?

• Neutrons

• Electrons

• Protons

• Atoms

Why is the atomic number sometimes referred to as the proton number?

• Because it equals the number of neutrons

• Because it equals the atomic mass

• Because it equals the number of electrons

• Because it equals the number of protons

How does the atomic number change as you move across a row in the periodic table?

• It increases by 1

• It doubles

• It remains the same

• It decreases by 1

Where is the atomic number typically located in relation to the element symbol on the periodic table?

• Below the element symbol

• To the left of the element symbol

• To the right of the element symbol

• Above the element symbol

What is the charge of elements on the periodic table?

• Negative

• Neutral

• Variable

• Positive

For a neutral atom, the number of protons is equal to the number of which other subatomic particle?

• Atoms

• Electrons

• Neutrons

• Ions

If an element has an atomic number of 79, how many electrons does it have when neutral?

• 78

• 79

• 81

• 80

What is the significance of the atomic number in identifying an element?

• It determines the element's mass

• It identifies the element's position in the periodic table

• It shows the element's color

• It indicates the element's reactivity