Question 1

Which of the following types of electromagnetic radiation has the highest energy per photon?

Accepted Answer

Gamma rays

Question 2

A red shirt appears red because:

Accepted Answer

It reflects red light and absorbs all other colors

Question 3

Which of the following correctly arranges visible light, X-rays, and microwaves in order of increasing frequency?

Accepted Answer

Microwaves \u003c Visible light \u003c X-rays

Question 4

The wavelength ($$\lambda) $$and frequency ($$
u) of $$light are related by the equation:

Accepted Answer

$$c = \lambda 
u$$

Question 5

Which statement best describes the Bohr model of the hydrogen atom?

Accepted Answer

Electrons move in quantized orbits with fixed energies

Question 6

When an electron in a hydrogen atom transitions from $$n=4 to$$ $$n=2$$, what is emitted?

Accepted Answer

A photon with a specific wavelength

Question 7

Which quantum number primarily determines the size and energy of an orbital?

Accepted Answer

Principal quantum number ($$n)$$

Question 8

How many orbitals are present in the $$d$$ subshell?

Accepted Answer

5

Question 9

Which of the following electron configurations represents a ground-state lithium atom?

Accepted Answer

$$1s^2$$ $$2s^1$$

Question 10

According to Hund’s rule, when filling $$p$$ orbitals, electrons:

Accepted Answer

Fill each orbital singly with parallel spins before pairing

Question 11

Which element has the electron configuration $$[Ne]3s^2$ 3p^5$?

Accepted Answer

Chlorine

Question 12

What is the number of valence electrons in silicon ($$Si$$)?

Accepted Answer

4

Question 13

Which of the following statements about atomic size is correct?

Accepted Answer

Atomic size decreases across a period from left to right

Question 14

Which group of elements is characterized by a full outer shell and is chemically inert?

Accepted Answer

Noble gases

Question 15

The energy required to remove an electron from a neutral atom in the gas phase is called:

Accepted Answer

Ionization energy

Question 16

Which of the following elements is expected to have the highest metallic character?

Accepted Answer

Cesium ($$Cs)$$

Question 17

Which of the following is a correct statement about the filling order of atomic orbitals?

Accepted Answer

The $$4s$$ orbital fills before the $$3d$$ orbital

Question 18

Which of the following ions is most likely to form when a Group 2 element reacts?

Accepted Answer

$$2+$$ cation

Question 19

Which of the following best explains why noble gases are chemically stable?

Accepted Answer

They have a full valence shell of electrons

Question 20

A photon of light has a wavelength of $$500\ nm. $$What is its frequency? (Speed of light $$c = 3.0 	imes 10^8$\ m/s)$$

Accepted Answer

$$6.0 	imes 10$$^{14}$$\ Hz$$

Light, Quantum Mechanics, and Electron Configuration: Foundations of Atomic Structure

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