Understanding Atomic Structure

What are the three main particles that make up an atom?

• Quarks, Gluons, Bosons

• Electrons, Positrons, Neutrinos

• Protons, Neutrons, Photons

• Protons, Neutrons, Electrons

What is the charge of a proton?

• +1 elementary charge

• 0 elementary charge

• -1 elementary charge

• +2 elementary charge

Where are neutrons located in an atom?

• In the nucleus of an atom.

• In the electron cloud

• Floating freely in the nucleus

• In the outer shell of the atom

What is the charge of an electron?

• -1 coulombs

• +1.602 x 10^-19 coulombs

• -1.602 x 10^-19 coulombs

• 0 coulombs

How do protons and electrons compare in mass?

• Protons are much more massive than electrons.

• Protons are lighter than neutrons.

• Electrons are more massive than protons.

• Protons and electrons have the same mass.

What is the atomic number of an element?

• The atomic number of an element is the number of protons in its nucleus.

• The atomic number is the number of neutrons in the nucleus.

• The atomic number represents the mass of an element.

• The atomic number is the total number of electrons in an atom.

What does the mass number of an atom represent?

• The mass number indicates the atomic weight of an element.

• The mass number represents the total number of isotopes of an atom.

• The mass number is the number of electrons in an atom.

• The mass number represents the total number of protons and neutrons in an atom.

How are electrons arranged in an atom?

• Electrons are located only in the nucleus of an atom.

• Electrons are randomly distributed throughout the atom without any structure.

• Electrons are arranged in a straight line away from the nucleus.

• Electrons are arranged in energy levels or shells around the nucleus of an atom.

What is the maximum number of electrons in the first energy level?

• 2

• 4

• 1

• 8

What is the principle behind the Aufbau principle in electron configuration?

• Electrons fill orbitals randomly without any order.

• Electrons only occupy the highest energy levels first.

• Electrons fill all orbitals of the same energy level before moving to the next energy level.

• Electrons fill orbitals starting from the lowest energy level to the highest.