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e.<br />
____ 178. How many valence electrons does a phosphorus atom have?<br />
a. 2<br />
b. 6<br />
c. 3<br />
d. 5<br />
e. 4<br />
____ 179. An element has the following electronic configuration in its outermost shell. In simple ionic compounds the<br />
oxidation number of this element would be __________.<br />
a. -1<br />
b. -2<br />
c. -3<br />
d. +2<br />
e. +1<br />
ns np<br />
____ 180. Consider the following electron transfer diagram representing the formation of a binary ionic compound from<br />
atoms of its constituent elements. Which response correctly identifies the elements?<br />
a. M = Na, X = O<br />
b. M = Ca, X = Cl<br />
c. M = K, X = S<br />
d. M = Na, X = S<br />
e. M = Rb, X = O<br />
____ 181. Which Lewis dot notation for atoms and ions is correct for the reaction for the formation of aluminum oxide?<br />
a.<br />
b.<br />
c.<br />
d.<br />
e.<br />
____ 182. Which of the following pairs of species are isoelectronic?<br />
a. Ne, K +<br />
b. Rb, Cs<br />
c. Cl - , S 2-
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