Question 1

Which of the following types of electromagnetic radiation has the shortest wavelength and the highest energy?

Accepted Answer

Gamma rays

Question 2

A thunderstorm occurs and you see lightning before you hear thunder. This is because:

Accepted Answer

Light travels much faster than sound

Question 3

What is the relationship between wavelength ($$\lambda$$), frequency ($$
u$$), and the speed of light ($$c$$)?

Accepted Answer

$$c = \lambda 
u$$

Question 4

Which color of visible light has the longest wavelength?

Accepted Answer

Red

Question 5

When an electron in an atom absorbs energy and moves to a higher energy level, this state is called:

Accepted Answer

Excited state

Question 6

How many electrons can the third energy level ($$n=3) $$hold?

Accepted Answer

18

Question 7

Which of the following statements about atomic spectra is TRUE?

Accepted Answer

Each element emits a unique set of wavelengths when excited.

Question 8

Which sublevel contains a maximum of 10 electrons?

Accepted Answer

d

Question 9

What is the correct electron configuration for magnesium (Mg, atomic number 12)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$

Question 10

Which of the following elements has the highest ionization energy?

Accepted Answer

Chlorine (Cl)

Question 11

Which of the following best describes the trend in atomic size across a period from left to right?

Accepted Answer

Atomic size decreases

Question 12

Which orbital shape is described as a 'dumbbell'?

Accepted Answer

p orbital

Question 13

Which of the following elements is most metallic?

Accepted Answer

Cesium (Cs)

Question 14

If an electron falls from $$n=4 to$$ $$n=2 in a $$hydrogen atom, what happens?

Accepted Answer

A photon is emitted

Question 15

Which of the following is the abbreviated electron configuration for sodium (Na)?

Accepted Answer

$$[Ne] 3s^1$

Question 16

Which of the following statements about Hund’s Rule is correct?

Accepted Answer

Electrons occupy separate orbitals of the same energy before pairing up

Question 17

Which block of the periodic table contains the transition metals?

Accepted Answer

d block

Question 18

Which of the following best explains why UV light causes sunburn while visible light does not?

Accepted Answer

UV light has a shorter wavelength and higher energy than visible light

Question 19

How many p orbitals are present in a single energy level?

Accepted Answer

3

Question 20

Which of the following is the correct order of filling for the following orbitals?

Accepted Answer

4s, 3d, 4p

Quantum Mechanics and Periodic Properties: Electrons, Orbitals, and the Periodic Table

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