Question 1

Which of the following statements about atoms is INCORRECT?

Accepted Answer

Atoms are manufactured in plants, and in humans during pregnancy.

Question 2

What is the difference between an element and an atom?

Accepted Answer

An element is a material made of only one kind of atom, while an atom is the fundamental unit of an element.

Question 3

A neutral atom of carbon has 6 protons. How many electrons does it have?

Accepted Answer

$$6$$

Question 4

A nucleus with an atomic number of $$44$$ and a mass number of $$100$$ must have how many neutrons?

Accepted Answer

$$56$$

Question 5

Which of the following best describes isotopes?

Accepted Answer

Atoms of the same element with the same number of protons but different numbers of neutrons.

Question 6

Which of the following is true about the periodic table?

Accepted Answer

Each vertical column is called a group, and each horizontal row is called a period.

Question 7

Which atom is larger: a lithium atom or a fluorine atom?

Accepted Answer

A lithium atom

Question 8

Which of the following is a conceptual model?

Accepted Answer

A description of an atom's structure using energy levels and quantum numbers.

Question 9

Each spectral line in an atomic spectrum represents:

Accepted Answer

A specific frequency of light emitted by an element.

Question 10

Why does the hydrogen spectrum consist of many spectral lines?

Accepted Answer

One electron can be boosted to many different energy levels.

Question 11

When an atom is excited, what happens?

Accepted Answer

Electrons are boosted to higher energy levels.

Question 12

According to the quantum hypothesis, the energy of a photon is directly proportional to:

Accepted Answer

The frequency of light

Question 13

Which of these photons has the greatest energy?

Accepted Answer

Blue light

Question 14

Which of the following is a quantum number?

Accepted Answer

$$2$$

Question 15

Why don’t electrons in atoms collapse into the nucleus according to Bohr’s model?

Accepted Answer

Electrons can only lose specific amounts of energy equivalent to transitions between levels.

Question 16

Which of the following best explains why only certain energy levels are allowed for electrons in atoms?

Accepted Answer

Only an integral number of standing electron waves can fit in the electron’s path around the nucleus.

Question 17

A sample of an unknown gas is energized and emits light with a unique pattern of spectral lines. What instrument would you use to identify the element?

Accepted Answer

A spectroscope

Question 18

Which of the following best describes the shell model of the atom?

Accepted Answer

Electrons occupy discrete energy levels or shells around the nucleus.

Question 19

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its mass number?

Accepted Answer

$$35$$

Question 20

Which of the following statements about atomic spectra is correct?

Accepted Answer

The frequencies of light emitted by an atom often add up to a higher frequency of light emitted by the same atom.

Atoms and the Periodic Table: Structure, Models, and Quantum Concepts

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