Question

question 14 (1 point)
according to the aufbau principle,
o a electrons in the same orbital must have opposite spins.
o b electrons enter orbitals of highest energy first.
o c an orbital may be occupied by only two electrons.
o d electrons enter orbitals of lowest energy first.

question 15 (1 point)
what is the number of electrons in the outermost energy level of an oxygen atom?
o a 4
o b 6
o c 8
o d 2

question 16 (1 point)
which color of visible light has the shortest wavelength?
o a green
o b violet
o c yellow
o d blue

Explanation:

Question 14

The Aufbau principle states that electrons enter orbitals of lowest energy first. Option a refers to the Pauli exclusion principle. Option b is incorrect as it should be lowest energy. Option c is about the general property of an orbital (from Pauli exclusion principle in part).

Oxygen has an atomic number of 8. Its electron configuration is \(1s^{2}2s^{2}2p^{4}\). The outermost energy level is the second energy level (\(n = 2\)) which has \(2 + 4=6\) electrons.

In the visible light spectrum (ROYGBIV - red, orange, yellow, green, blue, indigo, violet), as we move from red to violet, the wavelength decreases and the frequency increases. Violet light has the highest frequency and thus the shortest wavelength among the given options.

Answer:

d. electrons enter orbitals of lowest energy first.

Question 15