Unit 2 Summative Review

Fluorine (F) is a nonmetal. It has a strong tendency to complete its outermost shell of electrons.

• It will gain one electron and form F^-.

• It will gain two electrons and form F^2-.

• It will lose one electron and form F⁺.

• 
  It will lose two electrons and form F²⁺.

How many valence electrons does an atom of the element neon (Ne) have?

• one

• two

• eight

• ten

Calcium forms the cation Ca²⁺. Which model can be used to represent the electron configuration of the ion?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

NaCl and KBr are ionic compounds. H₂O and C₆H₁₂O₆ are covalent compounds. How does Vanessa describe the difference between the melting points and elemental compositions of ionic and covalent compounds?

• Ionic compounds have lower melting points than covalent compounds. Ionic compounds are composed of a metal and a nonmetal while covalent compounds are composed of all nonmetals.

• Ionic compounds have higher melting points than covalent compounds. Ionic compounds are composed of all nonmetals while covalent compounds are composed of a metal and a nonmetal.

• Ionic compounds have higher melting points than covalent compounds. Ionic compounds are composed of a metal and a nonmetal while covalent compounds are composed of all nonmetals.

• Ionic compounds have melting points that are similar to covalent compounds. Ionic compounds are composed of a metal and a nonmetal while covalent compounds are composed of all nonmetals.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Why do noble gases typically not react with other elements chemically?

• 
  because they have more protons than other elements

• 
  because they have fewer neutrons than other elements

• because they have a single valence electron in their outer shell

• because they have a full outer shell of valence electrons

________ have no effect on the net charge of an atom.

What are the sum of charges for a neutral compound?

• 0

• +1

• -1

• +2

Tags

NGSS.HS-PS1-7

Which of the following compounds is NOT composed of three atoms?

• Calcium oxide

• dinitrogen oxide

• iron disulfide

• silcone dioxide

Tags

NGSS.MS-PS1-1

What is the formula for sulfur hexachloride?

Tags

NGSS.MS-PS1-1

Neon has _____ protons.

Tags

NGSS.MS-PS1-1