chem

Question 1

What is the meaning of ‘atom’?

Answer 1

An atom is the smallest unit of matter that retains the properties of an element.

Question 2

True or False: The nucleus is located outside the atom.

Answer 2

False

Question 3

What particles make up the nucleus of an atom?

Answer 3

The nucleus is made up of protons and neutrons.

Question 4

Fill in the blank: The force that holds protons and neutrons together in the nucleus is called __________.

Answer 4

nuclear force

Question 5

What is the electromagnetic force?

Answer 5

The electromagnetic force is a fundamental force that causes interactions between charged particles.

Question 6

Which subatomic particle has a positive charge?

Answer 6

Proton

Question 7

Multiple Choice: Which of the following particles is neutral? A) Proton B) Electron C) Neutron

Answer 7

C) Neutron

Question 8

What is the charge of an electron?

Answer 8

An electron has a negative charge.

Question 9

True or False: Electrons are found in the nucleus of the atom.

Answer 9

False

Question 10

What is the primary role of electrons in an atom?

Answer 10

Electrons are responsible for chemical bonding and reactions.

Question 11

Fill in the blank: The number of protons in the nucleus determines the __________ of an element.

Answer 11

atomic number

Question 12

What is an isotope?

Answer 12

Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons.

Question 13

Multiple Choice: Which particle is involved in forming chemical bonds? A) Proton B) Neutron C) Electron

Answer 13

C) Electron

Question 14

What is the mass of a neutron compared to a proton?

Answer 14

A neutron has approximately the same mass as a proton.

Question 15

True or False: The nucleus contains most of the atom’s mass.

Answer 15

True

Question 16

Fill in the blank: The region around the nucleus where electrons are likely to be found is called the __________.

Answer 16

electron cloud

Question 17

What determines the chemical properties of an element?

Answer 17

The arrangement of electrons, particularly the outermost electrons.

Question 18

Multiple Choice: The strong nuclear force operates at what distance? A) Long range B) Short range C) Infinite range

Answer 18

B) Short range

Question 19

What is the significance of the atomic number?

Answer 19

The atomic number identifies the element and equals the number of protons in the nucleus.

Question 20

True or False: Electromagnetic force can attract and repel particles.

Answer 20

True

Question 21

What is the role of neutrons in the nucleus?

Answer 21

Neutrons help stabilize the nucleus and reduce repulsion between protons.

Question 22

Fill in the blank: The __________ force is responsible for the attraction between electrons and the nucleus.

Answer 22

electromagnetic

Question 23

What is a cation?

Answer 23

A cation is a positively charged ion that has lost one or more electrons.

Question 24

What is an anion?

Answer 24

An anion is a negatively charged ion that has gained one or more electrons.

Question 25

Multiple Choice: The number of neutrons in an atom can vary, resulting in A) Ions B) Isotopes C) Molecules

Answer 25

B) Isotopes

Question 26

What does the term ‘mass number’ refer to?

Answer 26

Mass number is the total number of protons and neutrons in an atom’s nucleus.