Quiz on Elements

What is an element?

• A pure substance made of one type of atom

• A mixture of substances

• A substance that can be broken down chemically

• A compound of different atoms

Which of the following is NOT an element?

• Gold (Au)

• Oxygen (O)

• Water (H₂O)

• Iron (Fe)

Which element is a liquid at room temperature?

• Mercury (Hg)

• Gold (Au)

• Oxygen (O)

• Iron (Fe)

What is the atomic number of an element?

• The number of neutrons

• The number of protons in the nucleus

• The number of electrons

• The total number of protons and neutrons

Which of the following is a characteristic of metals?

• Dull appearance and soft

• Brittle and poor conductors

• Good conductors of heat and electricity

• Found only as gases at room temperature

Which of the following is a non-metal?

• Iron (Fe)

• Oxygen (O)

• Silver (Ag)

• Copper (Cu)

What is a metalloid?

• A pure metal with high conductivity

• A substance with properties of both metals and non-metals

• A non-metal that cannot conduct electricity

• A gas that reacts with acids

Which group in the periodic table contains highly reactive metals?

• Group 2 - Alkaline Earth Metals

• Group 1 - Alkali Metals

• Group 17 - Halogens

• Group 18 - Noble Gases

Which of the following statements about compounds is true?

• Compounds can be separated physically

• Compounds consist of elements chemically combined

• Compounds are mixtures of elements

• Compounds are made of only one type of atom

Which of the following is an example of a mixture?

• Water (H₂O)

• Carbon Dioxide (CO₂)

• Air

• Sodium Chloride (NaCl)