What is the main focus of the video?

• Chemical reactions of elements

• The history of the periodic table

• The discovery of new elements

• The periodic trend for atomic size

Which element is mentioned as the largest on the periodic table?

• Francium

• Lithium

• Hydrogen

• Oxygen

Why do atoms get larger as you move down a group in the periodic table?

• They gain more protons

• They lose electrons

• They gain more energy levels

• They have a stronger nucleus

As you move from right to left across a period, what happens to the atomic number?

• It increases

• It doubles

• It decreases

• It remains the same

What is the effect of having fewer protons in the nucleus?

• Stronger attraction to electrons

• Weaker nucleus allowing electrons to spread out

• Increased atomic number

• Decreased atomic mass

Which factor is more significant in determining atomic size?

• Electron configuration

• Atomic mass

• Number of energy levels

• Number of protons

In the example comparing aluminum and gallium, which is larger and why?

• Aluminum, because it has fewer energy levels

• Gallium, because it has more energy levels

• Aluminum, because it has more protons

• Gallium, because it has fewer protons

When comparing rubidium and iodine, why is rubidium larger?

• It is in a higher period

• It has fewer protons

• It has a stronger nucleus

• It has more energy levels

What should you consider first when comparing atomic sizes?

• Number of energy levels

• Number of protons

• Atomic mass

• Electron configuration

What is the purpose of the video conclusion?

• To summarize the content

• To provide a quiz

• To introduce a new topic

• To ask for feedback and engagement