Chemistry Quiz

What is the total number of neutrons in a sodium atom with a mass number of 23?

• 11

• 12

• 23

• 10

What is valency?

• The mass of an atom

• The number of protons in an atom

• The number of electrons an atom needs to gain, lose, or share to become stable

• The total number of neutrons

Which of the following is an example of an isotope?

• Sodium-23

• Carbon-12

• Hydrogen-1

• Oxygen-16

How did Mendeleev arrange the elements in the periodic table?

• By increasing atomic number

• By increasing atomic mass and their chemical properties

• By their physical properties

• By their valency

What is the atomic number of Sulphur?

• 32

• 16

• 8

• 12

What is the formula for Hydrogen Chloride using the criss-cross method?

• H₂Cl

• HCl

• HCl₂

• H₂Cl₂

Which of the following is a cation?

• Cl⁻

• Na⁺

• O²⁻

• S²⁻

What is the valency of the element with atomic number 3?

• 2

• 3

• 1

• 0

Which of the following properties is characteristic of metals?

• Brittle

• Dull appearance

• Good conductors of heat and electricity

• Poor conductors of electricity

What is an alloy?

• A pure element

• A mixture of two or more metals or a metal and another element

• A non-metal compound

• A gaseous element