Ions Practice_The Atom & The Periodic Table Unit

When an element gains electrons it becomes...

• A negative ion

• A positive ion

• An isotope

• it remains an element

When an element loses electrons it becomes...

• A negative ion

• A positive ion

• An isotope

• it remains an element

The amount of valence an element has is related to...

• the average number of isotopes of an element

• the oxidation number of the element

• the energy levels that an element has

• the atomic mass of an element

An atom's valence electrons are those electrons that have the HIGHEST energy level.

• True

• False

Atoms tend to be stable and nonreactive if they have _________ valence electrons.

• 2

• 4

• 6

• 8

In the periodic table, the number of valence electrons in each element ___________ from left to right across each period.

• Increases

• Decreases

• Stays the same

Which correctly describes the ion below?

Sr⁺²

• Gains 2 electrons

• Lost 2 electrons

• Gains 2 protons

• Lost 2 protons

Which correctly describes the ion below?

P^-3

• Gains 3 electrons

• Lost 3 electrons

• Gains 3 protons

• Lost 3 protons

What is an ion?

• an atom that has lost or gained electrons and is no longer neutral

• an atom that has lost or gained protons and is no longer neutral

• an atom that has lost or gained neutrons and is no longer neutral

What is the charge of an atom that has lost one electron?

• -1
• -2
• +1
• +2