Pre Test/Post Test 5.1,5.2 & 5.3

Where are the valence electrons located in an atom?

• The nucleus

• The outermost shell

• The d orbitals

• The first shell

What are the valence electrons in an atom responsible for?

• The atomic size

• The relative atomic mass

• The type of chemical bonding

• The melting and boiling point

Atoms take part in the formation of chemical bond to

• increase their energy

• neutralise their charges

• increase the density of their charges

• achieve a stable electron arrangement

How many electrons does nitrogen, N need to gain in order to achieve a stable electron arrangement?

• 2

• 3

• 5

• 7

• 8

An atom that donates an electron forms

• a cation

• an anion

• an ionic bond

• a covalent bond

Two atoms share electrons to form

• a cation

• an anion

• an ionic bond

• a covalent bond

What is the charge of calcium, Ca ions when it achieve a stable electron arrangement?

R react with S to form an ionic compound with the formula R₂S₃. Which of the following electron arrangements of atom R and atom S is true.

• R: 2.8.3 , S: 2.6

• R: 2.8.3 , S: 2.8.2

• R: 2.8.2 , S: 2.8.3

• R: 2.8.2 , S: 2.5

Which of the following compound is an ionic compound?

• CCl₄

• H₂O

• CaCl₂

• HCl

What is the net charge of of the the compound, aluminium oxide, Al₂O₃?

• 0

• +2

• -2

• +3

• -3