An atom’s oxidation number changes from –2 to –5. Was the atom oxidized or reduced, and how many electrons were required for the change? A. Oxidized, 2 electrons
B. Oxidized, 3 electrons
C. Reduced, 2 electrons
D. Reduced, 3 electrons
E. None of the Above

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8