Question

21.1s 2s 2pwhat is incorrect about this orbital diagram?a) both arrows in the 2p box should be pointing upb) there is nothing incorrect with this diagramc) there should be 1 electron (arrow) in the first 2p box and one in the 2nd 2p box.d) all the arrows should be pointing up.22.1s 2s 2pthis orbital diagram represents:a) cb) bc) nd) o23.1s 2s 2pthis orbital diagram represents:a) carbonb) boronc) nitrogend) oxygen24. which of the following orbital diagrams correctly represents the electron configuration of carbon?a) 1s ↓↑ 2s ↓↑ 2p ↑↓b) 1s ↓↑ 2s ↓↑ 2p ↑↑c) 1s ↓↑ 2s ↑ 2p ↑↓d) 1s ↓↑ 2s ↑↓ 2p ↑25. an orbital diagram uses arrows to represent...a) electron cloudb) protonsc) shellsd) electrons

Explanation:

Question 21

Step1: Apply Pauli Exclusion Principle

Orbitals hold max 2 electrons, opposite spins. 2p orbitals each get 1 electron first (Hund's Rule), then pair.

Step2: Analyze given diagram

The 2p subshell has 2 electrons paired in one orbital, violating Hund's Rule (they should occupy separate orbitals first, parallel spins).

Step1: Count total electrons

1s: 2, 2s:2, 2p:3. Total = $2+2+3=7$.

Step2: Match to element

Atomic number 7 = Nitrogen (N).

Step1: Count total electrons

1s:2, 2s:2, 2p:2. Total = $2+2+2=6$.

Step2: Match to element

Atomic number 6 = Carbon (C).

Answer:

c) There should be 1 electron (arrow) in the first 2p box and one in the 2nd 2p box.

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Question 22