Periodic table

What is the primary basis for the arrangement of elements in the periodic table?

• Atomic number

• Alphabetical order

• Date of discovery

• Density

What is the chemical formula for water as mentioned in the passage?

• H2O

• CO2

• O2

• H2

Which of the following is a characteristic of metals as described in the passage?

• Poor conductors of electricity

• Brittle

• Malleable

• Gaseous

Where are nonmetals typically located on the periodic table?

• Left side

• Right side

• Middle

• Bottom

Why are noble gases known for their lack of reactivity?

• They have a full valence electron shell

• They are located on the left side of the periodic table

• They are metals

• They are always in a gaseous state