Science

Question 1

What is the symbol for the element Oxygen?

Answer 1

O

Question 2

What is the atomic number of Carbon?

Answer 2

6

Question 3

Fill in the blank: The atomic mass of Hydrogen is approximately ____.

Answer 3

1.008

Question 4

True or False: The elements on the periodic table are arranged by increasing atomic mass.

Answer 4

False

Question 5

What does the atomic number of an element represent?

Answer 5

The number of protons in the nucleus.

Question 6

Which scientist proposed the first atomic theory?

Answer 6

John Dalton

Question 7

What is the name of the group of elements in the far right column of the periodic table?

Answer 7

Noble gases

Question 8

Multiple Choice: Which element has the atomic number 1? A) Helium B) Hydrogen C) Lithium

Answer 8

B) Hydrogen

Question 9

What is the term for the weighted average of the masses of an element’s isotopes?

Answer 9

Atomic mass

Question 10

What is the most abundant element in the universe?

Answer 10

Hydrogen

Question 11

True or False: Isotopes of an element have the same number of protons but different numbers of neutrons.

Answer 11

True

Question 12

Fill in the blank: The periodic table was first organized by ____ in 1869.

Answer 12

Dmitri Mendeleev

Question 13

What is the significance of the periodic law?

Answer 13

It states that the properties of elements are periodic functions of their atomic numbers.

Question 14

Which type of bond involves the sharing of electron pairs between atoms?

Answer 14

Covalent bond

Question 15

What is the name of the element with the symbol ‘Fe’?

Answer 15

Iron

Question 16

Multiple Choice: Which of the following is a metalloid? A) Gold B) Silicon C) Chlorine

Answer 16

B) Silicon

Question 17

What does the term ‘valence electrons’ refer to?

Answer 17

Electrons in the outermost shell of an atom.

Question 18

Fill in the blank: The modern atomic theory includes the concept of ____ which states that atoms are indivisible.

Answer 18

subatomic particles

Question 19

True or False: The mass number of an element is the sum of its protons and electrons.

Answer 19

False

Question 20

What is the name of the negatively charged particle in an atom?

Answer 20

Electron

Question 21

What is the primary purpose of the periodic table?

Answer 21

To organize elements based on their properties and atomic structure.

Question 22

Which element is known as the ‘building block of life’?

Answer 22

Carbon

Question 23

Multiple Choice: What is the atomic mass of Helium? A) 4.0026 B) 1.008 C) 12.011

Answer 23

A) 4.0026

Question 24

Fill in the blank: The first model of the atom was proposed by ____ in 1803.

Answer 24

John Dalton

Question 25

True or False: All elements have a unique atomic number.

Answer 25

True