The video tutorial explains the organization of the periodic table, starting with Dmitri Mendeleev's discovery of periodic patterns based on atomic mass. It then covers Henry Moseley's improvement by arranging elements by atomic number. The classification of elements into metals, non-metals, and metalloids is discussed, along with the significance of periods and groups. The tutorial concludes with a hypothetical exercise on discovering a new element.

Who is credited with the creation of the periodic table?

• Dimitri Mendeleev

• Marie Curie

• Albert Einstein

• Isaac Newton

What key discovery did Henry Mosley make that improved the periodic table?

• The concept of isotopes

• The discovery of radioactivity

• The significance of atomic number

• The importance of atomic mass

Which category does mercury belong to?

• Metal

• Non-metal

• Noble gas

• Metalloid

What property is NOT associated with metals?

• Good conductors of thermal energy

• Poor conductors of thermal energy

• Ductile

• Malleable

Tags

NGSS.MS-PS3-3

Which elements are found to the right of the zigzag line on the periodic table?

• Metals

• Metalloids

• Non-metals

• Noble gases

What is a characteristic feature of non-metals?

• Good conductors of electric current

• Malleable

• Shiny

• Poor conductors of thermal energy

What are metalloids?

• Elements that are always solid at room temperature

• Elements with properties of both metals and non-metals

• Elements that are gases at room temperature

• Elements that are good conductors of electricity

What do elements in the same group of the periodic table have in common?

• Same number of electron shells

• Similar chemical and physical properties

• Same number of protons

• Same atomic mass

What information does the square of an element on the periodic table typically include?

• Atomic number, atomic mass, name, and chemical symbol

• Melting point and boiling point

• Discoverer's name and year of discovery

• Color and state at room temperature

If you discovered a new element with an atomic number of 117, what would be its likely properties?

• Metallic with high conductivity

• Gaseous at room temperature

• Similar to noble gases

• Metalloid with semi-conductive properties