Chemistry - January 2011

Part B–131

Which electron configuration represents the electrons of an atom in an excited state?

(1) 2-1       (3) 2-8-7
(2) 2-7-4   (4) 2-4

32 What is the total number of neutrons in an atom of O-18?

(1) 18   (3) 10
(2) 16   (4) 8

33 What is the net charge of an ion that has 8 protons, 9 neutrons, and 10 electrons?

(1) 1+    (3) 1-
(2) 2+    (4) 2-

34 Which element is malleable and a good conductor of electricity at STP?

(1) argon      (3) iodine
(2) carbon    (4) silver

35 Which element has chemical properties that are most similar to the chemical properties of sodium?

(1) beryllium    (3) lithium
(2) calcium       (4) magnesium

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