Question 1

Which of the following statements correctly distinguishes between an element and a compound?

Accepted Answer

An element consists of atoms or molecules with the same type of atom, while a compound consists of molecules with different types of atoms bonded together.

Question 2

Which of the following is a correct example of a molecule that is also an element?

Accepted Answer

$$\mathrm{O_3$}$$

Question 3

What property is shared by most metals at room temperature?

Accepted Answer

They are solids, except for mercury ($$\mathrm{Hg}$$), which is liquid.

Question 4

Which of the following elements is a metalloid?

Accepted Answer

Silicon ($$\mathrm{Si})$$

Question 5

Why is hydrogen ($$\mathrm{H}) $$not considered to share properties with Group 1A alkali metals, despite its position on the periodic table?

Accepted Answer

Hydrogen is a nonmetal and does not react with water to form basic solutions like alkali metals.

Question 6

Which of the following is a property of nonmetals at room temperature?

Accepted Answer

They exist as solids, liquids, or gases and do not conduct electricity.

Question 7

A student is given samples of boron ($$\mathrm{B}$$), sodium ($$\mathrm{Na}$$), and chlorine ($$\mathrm{Cl_2$}). $$Which sample is most likely to be a good semiconductor when doped?

Accepted Answer

Boron ($$\mathrm{B})$$

Question 8

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

Accepted Answer

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

Question 9

Which statement best explains why metals are ductile?

Accepted Answer

Metals have delocalized electrons that allow atoms to slide past each other without breaking bonds.

Question 10

Which of the following is a correct classification for the element arsenic ($$\mathrm{As}$$)?

Accepted Answer

Metalloid

Question 11

A scientist is studying the electrical conductivity of silicon ($$\mathrm{Si}) at $$different temperatures. What trend should they expect?

Accepted Answer

Silicon is a poor conductor at low temperatures but becomes a better conductor at high temperatures.

Question 12

Which of the following is NOT a property of metals?

Accepted Answer

They are brittle.

Question 13

Which element is most abundant in the universe?

Accepted Answer

Hydrogen ($$\mathrm{H})$$

Question 14

Which of the following elements is a main group metal?

Accepted Answer

Sodium ($$\mathrm{Na})$$

Question 15

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

Accepted Answer

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

Question 16

Which property is typical of metalloids?

Accepted Answer

They are generally poor conductors at low temperatures but moderately good at high temperatures.

Question 17

Which of the following elements is NOT a nonmetal?

Accepted Answer

Mercury ($$\mathrm{Hg})$$

Question 18

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

Accepted Answer

Groups are columns and periods are rows.

Question 19

A sample contains only $$\mathrm{H_2$}$$ molecules. How should this sample be classified?

Accepted Answer

As an element

Question 20

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

Accepted Answer

Mercury ($$\mathrm{Hg})$$

Elements, Compounds, and the Periodic Table: Classification and Properties

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