6-86

Which of the following is the correct electron configuration for the bromide ion, Br-?

a) [Ar] 4s²4p⁵

b) [Ar] 4s²3d¹⁰4p⁵

c) [Ar] 4s²3d¹⁰4p⁶

d) [Ar] 4s²3d¹⁰4p⁶5s¹

e) [Ar] 4s²3d¹⁰3p⁶

answer

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6-89

Which of the following elements has the largest number of electrons for which the principal quantum number, n, is 3?

a) Na

b) Al

c) Si

d) Cl

e) Ar

f) Zn

answer

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6-94

Which is the first element to have 4d electrons in its electron configuration?

a) Ca

b) Sc

c) Rb

d) Y

e) La

answer

text explanation