PS: Unit 3- Concept 1 CFA

Which element is most likely to gain electrons in a chemical reaction?

• Kr
• K
• Br
• Ca

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How does an atom of aluminum become an ion?

• It gains 3 electrons
• It gains 3 protons
• It loses 3 electrons
• It loses 3 neutrons

The electrons that are lost, gained, or shared in chemical bonds are called .

• valence electrons
• chemical electrons
• Lewis electrons
• none of these

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?

• 2
• 4
• 6
• 8

The properties of a compound are the properties of the elements that form it.

• Similar to
• Different from
• Identical to
• Derived from

Which of the following is the correct name for a compound between Magnesium and Sulfur?

• Magnesium sulfur
• Magnesium sulfide
• Magnesium (II) sulfide
• Magnesium disulfide

Which of the following is the correct name for a compound between Sodium and Chlorine?

• Sodium chlorine

• Sodium chloride

• Sodium (III) chloride

• Sodium trichloride

What type of ion is formed when sodium (Na) when it gives it's 1 valence electron away to a nonmetal?

• +1 cation
• +1 anion
• -1 cation
• -1 anion

Cations are ions with a _(positive or negative)_ charge that are formed when an atom _(gains or loses)_ electrons. [Hint: You will need to click 2 boxes.]

• Positive
• Negative
• Gains
• Loses

Anions are ions with a _(positive or negative)_ charge that are formed when an atom _(gains or loses)_ electrons. [Hint: You will need to click 2 boxes.]

• Positive
• Negative
• Gains
• Loses