Elements

Question 1

What is an element?

Answer 1

A substance that cannot be broken down into simpler substances by chemical means.

Question 2

What is the atomic number of an element?

Answer 2

The number of protons in the nucleus of an atom of that element.

Question 3

True or False: The mass number is the sum of protons and neutrons in an atom.

Answer 3

True

Question 4

What is the mass number of an atom with 6 protons and 6 neutrons?

Answer 4

12

Question 5

Fill in the blank: The atomic number determines the ______ of an element.

Answer 5

identity

Question 6

Which of the following elements has the atomic number 1? A) Helium B) Hydrogen C) Lithium

Answer 6

B) Hydrogen

Question 7

What is the primary use of oxygen?

Answer 7

Respiration and combustion.

Question 8

What does the term ‘isotope’ refer to?

Answer 8

Atoms of the same element with different numbers of neutrons.

Question 9

True or False: All isotopes of an element have the same chemical properties.

Answer 9

True

Question 10

What is the chemical symbol for gold?

Answer 10

Au

Question 11

Which element is used in batteries and has the atomic number 3?

Answer 11

Lithium

Question 12

Fill in the blank: The mass number of an element is always a ______ number.

Answer 12

whole

Question 13

What is the atomic number of carbon?

Answer 13

6

Question 14

What element is commonly used in light bulbs?

Answer 14

Tungsten

Question 15

True or False: The atomic mass is always a whole number.

Answer 15

False

Question 16

What is the primary use of helium?

Answer 16

Inflating balloons and as a cooling medium in cryogenics.

Question 17

Which element has the highest atomic number that occurs naturally?

Answer 17

Uranium (atomic number 92)

Question 18

Fill in the blank: Elements in the same column of the periodic table have similar ______.

Answer 18

properties

Question 19

What is the atomic number of sodium?

Answer 19

11

Question 20

Which element is essential for the production of thyroid hormones?

Answer 20

Iodine

Question 21

What is the chemical symbol for silver?

Answer 21

Ag

Question 22

True or False: The atomic number can change for an element without altering its identity.

Answer 22

False

Question 23

What is the main use of nitrogen?

Answer 23

To make fertilizers and in the production of ammonia.

Question 24

What is the mass number of an atom with 15 protons and 16 neutrons?

Answer 24

31

Question 25

Which element is used in the making of steel and has the atomic number 26?

Answer 25

Iron

Question 26

Fill in the blank: The periodic table organizes elements according to their ______ and properties.

Answer 26

atomic number