Chapter 9 Practice Test

An electron dot diagram shows an atom's number of

• protons
• electrons
• chemical bonds
• valence electrons

The force of attraction that holds atoms together as a result of the rearrangement of electrons between them is called a(n)

• electron dot diagram
• chemical bond
• chemical reaction
• polar bond

Which of these elements will become stable by losing one valence electron?

• Ca
• Na
• O
• Cl

Which of these elements is least likely to react with the other elements?

• Ca
• Cl
• N
• Ar

Which of these elements will form a -2 charge?

• Ca
• O
• Cl
• N

Why don't noble gases like to react?

• They don't have any valence electrons to be stable
• They have too many valence electrons to be stable
• They don't have enough valence electrons to be stable
• They already have enough valence electrons to be stable

Chemical properties of an element are determined by

• the name of the element
• the number of valence electrons
• how big the element is
• whether the element is endothermic or not

Metals ___ electrons and become _____, while nonmetals ___ electrons and become ___.

• gain, positive, lose, negative
• gain, negative, lose, positive
• lose, positive, gain, negative
• lose, negative, gain, positive

Sodium is element number 11 and in group 1. Which of the following is NOT true?

• it has 11 protons
• it makes a +1 charge
• it has 11 valence electrons
• it is reactive

When an atom gains or loses electrons, it becomes a(n)

• ion
• crystal
• atom
• formula