Review Sheet -- Formation of Compounds, Chapter 4 Name _____________________________

Period _____ Date ___________________

Complete each statement.
  1. A(n) _______________ is an atom or group of atoms that carries and electric charge because it has gained or lost electrons.
  2. An arrangement of valence electrons like that found in helium, argon, neon, and similar elements is known as a(n) _______________ configuration.
  3. The bond formed when two atoms share one or more pairs of electrons with each other is called a(n) _______________.
  4. A compound that consists of ions is called a(n) _______________.
  5. A(n) _______________ is the particle formed when two or more atoms are held together by means of covalent bonds.

    6. True or False. Change the underlined word or phrase in each false statement to make it true.
  6. The elements in column 18 of the periodic table are chemically inactive.
  7. All of the noble gas elements except neon have eight electrons in their outermost energy level.
  8. In covalent bonding, atoms can achieve a noble gas configuration of electrons by sharing electrons.
  9. A typical potassium ion has a positive charge because it has lost an electron.
  10. The formula for methane, CH4, indicates that each methane molecule contains one carbon atom and four hydrogen atoms.

Consider the electron dot structures below to complete the table.
 

How many valence electrons?

Reactive or not?

Will bond formed be ionic or covalent?

 

11)

12)

13)

 

14)

15)

16)

 

17)

18)

19)

Listed below are some imaginary data for a series of compounds. Based on what you have learned, predict whether each compound is probably ionic or covalent.

  1. When melted, conducts an electric current
  2. Is highly soluble in water.
  3. Is composed of a metal and nonmetal
  4. Is composed of two nonmetals
  5. When dissolved in water, does not conduct an electric current.

Use the periodic table to complete the following table.

Atom

Number valence electrons

Gain or lose electrons to form ion?

Predicted charge on ion

Will form an ionic bond with Na or Cl

Resulting compound formula

Ca

25)

26)

27)

28)

29)

O

30)

31)

32)

33)

34)

Li

35)

36)

37)

38)

39)

Al

40)

41)

42)

43)

44)