Understanding the Modern Periodic Table

The video explains the modern periodic table, which is based on Mendeleev's arrangement but ordered by atomic number instead of atomic mass. This resolves issues like the placement of iodine and tellurium. The video also discusses the creation of new, highly radioactive elements and how their properties can be predicted. Finally, it describes the basic division of the periodic table into metals and nonmetals.

What is the modern periodic table primarily based on?

• Chemical reactivity

• Atomic mass

• Atomic number

• Elemental properties

How does the atomic number differ from atomic mass?

• Atomic number is the sum of protons and neutrons

• Atomic number is the number of protons

• Atomic mass is the number of electrons

• Atomic mass is the number of protons

Why did Mendeleev place iodine before tellurium in his table?

• Iodine has a higher atomic number

• Iodine has similar properties to other halogens

• Iodine has a higher atomic mass

• Iodine is more reactive

In the modern periodic table, which element comes first based on atomic number?

• Tellurium

• Chlorine

• Iodine

• Fluorine

How many elements are currently in the modern periodic table?

• Around 100

• Around 130

• Around 120

• Around 115

What is a characteristic of the new elements being created?

• They are stable

• They are non-metallic

• They are highly reactive

• They are highly radioactive

What can scientists predict about new elements based on their position in the periodic table?

• Their properties

• Their melting point

• Their atomic mass

• Their color

Where are metals generally located on the periodic table?

• Right-hand side

• Left-hand side

• Bottom

• Top

What is the basic division of the periodic table?

• Metals and nonmetals

• Solids and liquids

• Metals and gases

• Reactive and non-reactive elements

What will be explored further in the course regarding the periodic table?

• Subcategories of elements

• Element sizes

• Element shapes

• Element colors