Question 1

Which of the following statements best describes the periodic law?

Accepted Answer

When the elements are arranged in order of increasing atomic number, certain sets of properties recur periodically.

Question 2

Which group on the periodic table contains the noble gases, and what is a key property of these elements?

Accepted Answer

Group 8A; they are chemically inert and rarely form compounds.

Question 3

Which of the following best describes a metalloid?

Accepted Answer

An element with properties intermediate between metals and nonmetals, often a semiconductor.

Question 4

Which of the following elements is a diatomic molecule in its natural state?

Accepted Answer

Nitrogen ($$\mathrm{N_2$})$$

Question 5

A sodium atom ($$\mathrm{Na}) $$loses one electron to form a sodium ion ($$\mathrm{Na^+}). $$How many electrons does the sodium ion have, and which noble gas does it now have the same number of electrons as?

Accepted Answer

$$10$$ electrons; same as neon ($$\mathrm{Ne})$$

Question 6

Which of the following compounds is an example of an ionic compound?

Accepted Answer

$$\mathrm{NaCl}$$

Question 7

What is the correct empirical formula for a compound with the molecular formula $$\mathrm{N_2O_4}$$?

Accepted Answer

$$\mathrm{NO_2$}$$

Question 8

Which of the following best describes the difference between a molecular formula and an empirical formula?

Accepted Answer

A molecular formula shows the actual number of atoms in a molecule, while an empirical formula shows the simplest whole-number ratio of atoms.

Question 9

Which of the following is the correct name for the compound $$\mathrm{CaO}$$?

Accepted Answer

Calcium oxide

Question 10

Which property is NOT characteristic of metals?

Accepted Answer

Dull appearance

Question 11

Which of the following best explains why elements in the same group have similar chemical properties?

Accepted Answer

They have the same number of valence electrons.

Question 12

Which of the following is a property of nonmetals?

Accepted Answer

Dull appearance

Question 13

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by transferring electrons from one atom to another, resulting in attraction between oppositely charged ions.

Question 14

Which of the following elements is a liquid at room temperature?

Accepted Answer

Bromine ($$\mathrm{Br_2$})$$

Question 15

A chlorine atom ($$\mathrm{Cl}) $$gains one electron to form a chloride ion ($$\mathrm{Cl^-}). $$How many electrons does the chloride ion have, and which noble gas does it match?

Accepted Answer

$$18$$ electrons; same as argon ($$\mathrm{Ar})$$

Question 16

Which of the following is a correct statement about the formation of ionic compounds?

Accepted Answer

They are formed by the transfer of electrons from a metal to a nonmetal.

Question 17

Which of the following is the correct formula unit for sodium oxide?

Accepted Answer

$$\mathrm{Na_2O}$$

Question 18

Which of the following best describes a molecular element?

Accepted Answer

An element that exists in nature as molecules containing two or more atoms bonded together.

Question 19

Which of the following is the correct name for the compound $$\mathrm{$$MgCl_2$$}$$?

Accepted Answer

Magnesium chloride

Elements, Periodic Table, and Types of Chemical Bonds 08/27/2026

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