10 Chemistry Quiz

The Atomic Number of an element describes the

• number of its protons

• number of its neutrons

• number of its electrons

• mass of the nucleus

Which of the following electron configurations represents the electron configuration for the aluminium ion, Al³⁺?

• 2.8.3

• 2.8.2

• 2.8

• 2.3

What is the formula for the ion which has 9 protons and 10 electrons?

• F⁺

• F⁻

• Ne⁺

• Ne⁻

How many electrons are gained/lost by sodium and what is the charge on the ion that it forms?

• Loses 1 electrons to form a sodium ion with a charge of 1⁻

• Gains 1 electrons to form a sodium ion with a charge of 1⁻

• Loses 1 electrons to form a sodium ion with a charge of 1⁺

• Gains 1 electrons to form a sodium ion with a charge of 1⁺

The electron-dot structure for oxygen has how many dots in the outer shell?

• 2

• 4

• 6

• 8

Chlorine atoms tend to . . . ? . . . . when they form chemical compounds with metal.

• Lose electrons

• Gain electrons

• Neither lose nor gain electrons, they usually share electrons equally with metals

• Chlorine atoms do not form compounds with other atoms, chlorine is an inert gas.

What happens when a bromine atom becomes a bromine ion in a chemical reaction?

• A proton is gained by the nucleus.

• A proton is lost by the nucleus.

• An electron is lost from the electron cloud.

• An electron is added to the electron cloud.

Which of the following represents the correct formula for aluminium sulfide?

• AlS

• Al₂S₃

• AlS₂

List the atomic number and the mass number for: a) Al b) N

How many electrons are in the outer shell of: a) the group II elements b) the group III elements?