Q: Which of the following statements correctly describes the relationship between the frequency ($$\nu$$), wavelength ($$\lambda$$), and energy ($$E) of $$electromagnetic radiation?

$$E \propto \nu$$ and $$E \propto \dfrac{1}{\lambda}$$

Question 1

Which of the following statements correctly describes the relationship between the frequency ($$
u$$), wavelength ($$\lambda$$), and energy ($$E) of $$electromagnetic radiation?

Accepted Answer

$$E \propto 
u$$ and $$E \propto \dfrac{1}{\lambda}$$

Question 2

Which region of the electromagnetic spectrum has the shortest wavelength and the highest energy?

Accepted Answer

Gamma rays

Question 3

A sodium street lamp emits yellow light with a wavelength of $$589\ \mathrm{nm}. $$Which color of visible light has a higher frequency than this yellow light?

Accepted Answer

Blue

Question 4

Which of the following best explains why each element produces a unique atomic emission spectrum?

Accepted Answer

Each element has a unique set of allowed energy levels for its electrons.

Question 5

According to the Bohr model, what causes the emission of light from a hydrogen atom?

Accepted Answer

An electron falls from a higher energy orbit to a lower energy orbit, releasing a photon.

Question 6

How many electrons can occupy the $$3d$$ subshell in an atom?

Accepted Answer

10

Question 7

Which of the following electron configurations is NOT a valid ground-state configuration?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$\ $$3d^5$$\ $$4p^1$$

Question 8

Which principle states that electrons fill the lowest energy orbitals first?

Accepted Answer

Aufbau principle

Question 9

How many unpaired electrons are present in the ground-state electron configuration of phosphorus ($$Z=15$$)?

Accepted Answer

3

Question 10

Which of the following elements has the greatest metallic character?

Accepted Answer

Cesium ($$Cs)$$

Question 11

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

Accepted Answer

Atomic radius decreases due to increasing nuclear charge.

Question 12

What is the maximum number of electrons that can occupy the $$n=2$$ principal shell?

Accepted Answer

8

Question 13

Which of the following is the correct noble gas core notation for the ground-state electron configuration of calcium ($$Z=20$$)?

Accepted Answer

$$[Ar]\ 4s^2$

Question 14

Which of the following statements about valence electrons is TRUE?

Accepted Answer

Valence electrons are the electrons in the outermost principal energy level of an atom.

Question 15

Which of the following orbital diagrams for nitrogen ($$Z=7) is $$correct according to Hund's rule?

Accepted Answer

Three $$2p$$ orbitals each with one electron (all unpaired, parallel spins)

Question 16

Which of the following ions has the same electron configuration as argon ($$Z=18$$)?

Accepted Answer

$$Cl^-$$

Question 17

Which statement best describes the Pauli exclusion principle?

Accepted Answer

No two electrons in the same atom can have the same set of four quantum numbers.

Question 18

Which of the following elements has the highest first ionization energy?

Accepted Answer

Neon ($$Ne)$$

Question 19

How many core electrons does a chlorine atom ($$Z=17) $$have?

Accepted Answer

10

Question 20

Which of the following best explains why metals tend to lose electrons when forming ions?

Accepted Answer

Metals have low ionization energies and few valence electrons.

Electrons in Atoms and the Periodic Table: Study Notes

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