They are inversely proportional: $$c = \lambda \nu$$

Question 1

Which of the following best explains why helium is chemically inert while hydrogen is highly reactive?

Accepted Answer

Helium has a full outer shell of electrons, while hydrogen has only one electron and seeks to achieve a stable configuration.

Question 2

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

Accepted Answer

Gamma rays

Question 3

A red shirt appears red because:

Accepted Answer

It reflects red light and absorbs all other colors.

Question 4

Arrange the following types of electromagnetic radiation in order of increasing wavelength: X-rays, visible light, microwaves.

Accepted Answer

X-rays \u003c visible light \u003c microwaves

Question 5

According to the Bohr model, what happens when an electron in a hydrogen atom moves from the n = 4 orbit to the n = 2 orbit?

Accepted Answer

A photon of light is emitted with a specific wavelength.

Question 6

Which statement best describes the quantum-mechanical model of the atom?

Accepted Answer

Electrons occupy orbitals, which are probability maps of where the electron is likely to be found.

Question 7

How many valence electrons does silicon (Si) have?

Accepted Answer

4

Question 8

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

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^2$$

Question 9

Which principle states that orbitals may hold no more than two electrons with opposing spins?

Accepted Answer

Pauli exclusion principle

Question 10

Which of the following elements is most likely to form a $$+1$$ cation to achieve a noble gas configuration?

Accepted Answer

Sodium (Na)

Question 11

As you move down a group in the periodic table, what happens to atomic size and ionization energy?

Accepted Answer

Atomic size increases and ionization energy decreases.

Question 12

Which block of the periodic table contains the transition metals?

Accepted Answer

d block

Question 13

Which of the following best describes the relationship between wavelength ($$\lambda) $$and frequency ($$
u) of $$light?

Accepted Answer

They are inversely proportional: $$c = \lambda 
u$$

Question 14

Which of the following is a correct noble gas core notation for the electron configuration of sodium (Na)?

Accepted Answer

$$[Ne]\ 3s^1$

Question 15

Which of the following statements about metallic character is correct?

Accepted Answer

Metallic character increases as you move down a group and decreases as you move across a period.

Question 16

A hospital uses X-rays to image a patient’s bones. Which property of X-rays makes them suitable for this purpose?

Accepted Answer

X-rays can pass through soft tissue but are absorbed by denser materials like bone.

Question 17

Which of the following is the correct order of filling for the first three principal shells in a multi-electron atom?

Accepted Answer

$$1s \rightarrow 2s \rightarrow 2p \rightarrow 3s \rightarrow 3p$$

Question 18

Which of the following best explains why the emission spectrum of hydrogen consists of discrete lines?

Accepted Answer

Electrons in hydrogen atoms can only occupy specific energy levels, and transitions between these levels emit photons of specific energies.

Question 19

Which of the following is true about the principal quantum number ($$n) in $$the quantum-mechanical model?

Accepted Answer

As $$n$$ increases, the energy and size of the orbital increase.

Electrons in Atoms and the Periodic Table: Chapter 9 Study Guide

Study Guide - Practice Questions