Understanding the Modern Periodic Table

The video explains the modern periodic table, which is organized by atomic number rather than atomic mass, unlike Mendeleev's arrangement. This resolves issues like the placement of iodine and thorium. It also discusses the creation of new, highly radioactive elements and how their properties can be predicted. The periodic table is divided into metals and non-metals, with further subcategories to be explored.

What is the modern periodic table primarily based on?

• Chemical reactivity

• Elemental properties

• Atomic number

• Atomic mass

How is atomic mass different from atomic number?

• Atomic mass is the number of neutrons only, while atomic number is the total mass.

• Atomic mass is the number of electrons, while atomic number is the number of neutrons.

• Atomic mass is the total mass of protons and neutrons, while atomic number is the number of protons.

• Atomic mass is the number of protons only, while atomic number is the total mass.

Why was iodine placed before tellurium in Mendeleev's table despite its higher atomic mass?

• Iodine is a metal, while tellurium is a non-metal.

• Iodine is more reactive than tellurium.

• Iodine has similar properties to fluorine, chlorine, and bromine.

• Iodine has a higher atomic number.

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

• Chlorine

• Tellurium

• Iodine

• Fluorine

How many elements are currently recognized in the modern periodic table?

• Around 100

• Around 115

• Around 130

• Around 150

What is a characteristic of the new elements being created by scientists?

• They are stable and long-lasting.

• They are highly reactive with metals.

• They are highly radioactive and decay rapidly.

• They are non-reactive and inert.

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

• Their melting point

• Their chemical properties

• Their atomic mass

• Their color and texture

How is the periodic table divided in its most basic form?

• Into solids and gases

• Into reactive and non-reactive elements

• Into metals and non-metals

• Into gases and liquids

Where are metals generally located on the periodic table?

• On the left-hand side

• At the bottom

• In the center

• On the right-hand side

What will be explored in more detail throughout the course regarding the periodic table?

• The atomic structure of elements

• The discovery of new elements

• The subcategories within metals and non-metals

• The history of the periodic table