What is the maximum charge an ion is likely to have?

• 2
• 3
• 4
• 5

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the charge on the strontium ion?

• 2–
• 1–
• 1
• 2

The octet rule states that, in chemical compounds, atoms tend to have ____.

• the electron configuration of a noble gas
• more protons than electrons
• eight electrons in their principal energy level
• more electrons than protons

Tags

NGSS.HS-PS1-1

How many electrons does barium have to give up to achieve a noble-gas electron configuration?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-1

What is the formula of the ion formed when potassium achieves noble-gas electron configuration?

• K+
• K-
• K 2+
• K2-

Tags

NGSS.HS-PS1-1

Which is a typical characteristic of an ionic compound?

• Electron pairs are shared among atoms.
• The ionic compound has a low solubility in water.
• The ionic compound is described as a molecule.
• The ionic compound has a high melting point.

How do atoms achieve noble-gas electron configurations in single covalent bonds?

• One atom completely loses two electrons to the other atom in the bond.
• Two atoms share two pairs of electrons.
• Two atoms share two electrons.
• Two atoms share one electron.

A molecule with a single covalent bond is ____.

• CO2
• Cl2
• CO
• N3

Tags

NGSS.HS-PS1-1

What type of ions have names ending in -ide?

• only cations
• only anions
• only metal ions
• only gaseous ions

When Group 2A elements form ions, they ____.

• lose two electrons
• lose two protons
• gain two protons
• gain two electrons