Question

which of the following is the electronic configuration of indium, in?
a. 1s²2s²2p⁶3s²3p¹
b. rn 7s²5f¹⁴6d²
c. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
d. xe 6s²4f¹⁴5d¹⁰6p²
e. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p¹

Explanation:

Step1: Determine the atomic number of Indium

Indium (In) has an atomic number of 49.

Step2: Analyze each option

• Option A: The sum of electrons \(1 + 1+ 2+2 + 6+2+1=15\) (not 49).
• Option B: \([Rn]\) has 86 electrons. Total electrons \(86 + 2+14 + 2=104\) (not 49).
• Option C: Sum of electrons \(1 + 1+ 2+2 + 6+2+6+2+10+5 = 37\) (not 49).
• Option D: \([Xe]\) has 54 electrons. Total electrons \(54+2 + 14+10+2=82\) (not 49).
• Option E: Calculate the sum of electrons:

\(1 + 1+ 2+2 + 6+2+6+2+10+6+2+10+1\)
\(=2(1 + 2+2+6+2+6+2+10+6+2+10)+1\)
\(=2\times(41)+1 = 82 + 1=49\)

Answer:

E