B.8- B.11 19-24

19. For each of the following elements, identify the number of protons or electrons needed for an electrically neutral atom.


A. Carbon: 6 protons; 6 electrons
B. Aluminum: 13 protons; 13 electrons
C. Lead: 82 protons; 82 electrons
D. Chlorine: 17 protons; 17 electron

20. Decided wether each of the following atoms is electrically neutral.


A. Sulfur: 16 protons 18 electrons (No)
B. Iron: 26 protons 24 electrons (No)
C. Silver 47 protons 47 electrons (Yes)
D. Iodine: 53 protons 54 electrons (No)

21. Classify each of the following as an electrically neutral atom, an anion or a cation.

A. _O2-( Anion)
B. Cl (Neutral)
C._HG2+  (Cation)
D._Ag+ _(Cation) 


22.For each particle in Question 21, indicates whether the electrical charge or lack of electrical charge was from a neutral atom gaining electrons, losing electrons, or neither.

19. For each of the following elements, identify the number of protons or electrons needed for an electrically neutral atom.

A. _O2-( Gained an electron)

B. Cl (Neither)

C._HG2+  (Lost an electron)

D._Ag+ _{(Lost an electron)}

_{23. Write the symbol and show the electrical charge (if any) on the following atoms or ion:}

_{A. H}

_{B. S}

+

C. Cl -

_{D. Al}

+

24. Write the name and formula for the ionic compound that can be formed form these cations and anions:

A. k⁺ and I^- = KI

B. Ca²⁺ and S^2- = CaS

c. Fe³⁺ and Br^- = FeBr⁺

D. Ba²⁺ and OH^- = BaOh⁺

E. Nh₄⁺ and PO ^3- = Nh4PO^2-

F. Al³⁺ and O^2-= AlO²⁺