Question 1

Which of the following statements about the periodic table is correct?

Accepted Answer

A period is a horizontal row and a group is a vertical column.

Question 2

Which group in the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 3

An atom of magnesium has an atomic number of 12 and a mass number of 24. How many neutrons does it have?

Accepted Answer

$$24 - 12 = 12$$ neutrons

Question 4

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 5

What is the charge and mass of a neutron?

Accepted Answer

Charge: $$0$$, Mass: $$1$$ amu

Question 6

Which of the following is the correct electron arrangement for a neutral atom of oxygen (atomic number 8)?

Accepted Answer

$$2, 6$$

Question 7

Which of the following elements is a transition metal?

Accepted Answer

Iron (Fe)

Question 8

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its atomic symbol?

Accepted Answer

$$^{35}_{17}\mathrm{Cl}$$

Question 9

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 10

Which element would have the largest atomic size among the following: Li, Na, K, Rb?

Accepted Answer

Rb

Question 11

How many valence electrons does a main-group element in Group 16 have?

Accepted Answer

$$6$$

Question 12

Which of the following elements is a halogen?

Accepted Answer

Fluorine (F)

Question 13

A neutral atom of calcium has how many electrons?

Accepted Answer

$$20$$

Question 14

Which of the following trends is correct for ionization energy in the periodic table?

Accepted Answer

Ionization energy increases across a period from left to right.

Question 15

Which of the following is the correct chemical symbol for an element with atomic number 19?

Accepted Answer

K

Question 16

A hospital uses a radioactive isotope of iodine, $$^{131}\mathrm{I}$$, for thyroid imaging. How many neutrons are in this isotope?

Accepted Answer

$$131 - 53 = 78$$ neutrons

Question 17

Which of the following elements is a main-group (representative) element?

Accepted Answer

Carbon (C)

Question 18

Arrange the following elements in order of increasing ionization energy: Na, Mg, Al.

Accepted Answer

Na \u003c Mg \u003c Al

Question 19

Which of the following statements about electrons is correct?

Accepted Answer

Electrons have a charge of $$-1$$ and negligible mass.

Question 20

Which of the following is the correct atomic symbol for an isotope with 6 protons, 8 neutrons, and 6 electrons?

Accepted Answer

$$^{14}_{6}\mathrm{C}$$

Chapter 4 Study Guide: Periodic Table, Atomic Structure, and Periodic Trends

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