Question 1

Which of the following statements best describes an element?

Accepted Answer

An element is a pure substance that cannot be broken down into simpler substances.

Question 2

Which of the following is the correct chemical symbol for iron?

Accepted Answer

Fe

Question 3

The chemical symbol for gold is derived from its Latin name. What is the symbol and the Latin name?

Accepted Answer

Au, aurum

Question 4

Which group on the periodic table is known as the alkali metals?

Accepted Answer

Group 1A (1)

Question 5

A farmer is exposed to mercury (Hg) through contaminated water. Which of the following is a possible health effect of long-term mercury exposure?

Accepted Answer

Mental retardation

Question 6

Which of the following elements is a metalloid?

Accepted Answer

Boron (B)

Question 7

Which statement about the periodic table is correct?

Accepted Answer

Groups are vertical columns and periods are horizontal rows.

Question 8

Which of the following elements is a nonmetal found in Group 7A (17)?

Accepted Answer

Bromine

Question 9

A neutral atom of calcium (atomic number 20) contains how many electrons?

Accepted Answer

$$20$$

Question 10

Which subatomic particle is found outside the nucleus and has a negative charge?

Accepted Answer

Electron

Question 11

What is the mass number of a zinc atom that has 30 protons and 37 neutrons?

Accepted Answer

$$67$$

Question 12

Which of the following is NOT a property of metals?

Accepted Answer

Low melting point

Question 13

Which element is essential for the formation of bones and teeth and is classified as a macromineral?

Accepted Answer

Calcium (Ca)

Question 14

According to Dalton’s atomic theory, which statement is FALSE?

Accepted Answer

Atoms are created and destroyed in chemical reactions.

Question 15

A sample contains 6 protons, 6 neutrons, and 6 electrons. What is the atomic number and the element?

Accepted Answer

Atomic number $$6$$, element carbon

Question 16

Which experiment led to the discovery of the nucleus as a small, dense, positively charged region in the atom?

Accepted Answer

Rutherford’s gold foil experiment

Question 17

If an atom has 14 protons and 20 neutrons, what is its mass number?

Accepted Answer

$$34$$

Question 18

Which of the following elements is a trace element (micromineral) essential to human health?

Accepted Answer

Zinc (Zn)

Question 19

Which of the following statements about the electrical charges in an atom is correct?

Accepted Answer

Protons have a positive charge, electrons have a negative charge, and neutrons have no charge.

Question 20

A neutral atom of lead (Pb) has a mass number of 207 and an atomic number of 82. How many neutrons does it have?

Accepted Answer

$$125$$

Atoms and Elements: Structure, Classification, and Biological Importance

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