Understanding Ion Charges and Periodic Trends

What is the primary reason noble gases are unreactive?

• They are located at the end of the periodic table.

• They have a high atomic number.

• They have no electrons.

• They have a full outer energy level.

How do metals typically achieve a full octet?

• By sharing electrons.

• By becoming noble gases.

• By gaining electrons.

• By giving away electrons.

What charge do nonmetals typically take when they become ions?

• Variable

• Neutral

• Negative

• Positive

How can you determine the number of valence electrons for main group elements using the periodic table?

• By looking at the atomic number.

• By checking the period number.

• By checking the group number and subtracting one.

• By counting the number of protons.

What is a valence dot diagram used for?

• To show the total number of electrons in an atom.

• To represent the valence electrons of an atom.

• To display the atomic mass of an element.

• To illustrate the atomic structure.

What charge does sodium take when it becomes an ion?

• 0

• +1

• +2

• -1

Which element is a metalloid in the third period?

• Chlorine

• Sodium

• Magnesium

• Silicon

How do ions resemble noble gases?

• By having the same number of protons.

• By being in the same group.

• By having a similar electron configuration.

• By having the same atomic number.

What happens to the electron configuration of oxygen when it becomes an ion?

• It loses two electrons.

• It gains two electrons.

• It remains the same.

• It gains one electron.

When copper becomes an ion, from which sublevel does it lose an electron?

• 3d

• 4s

• 2p

• 1s