Quiz ผอ.1

Which of the following statements about atoms is true?

• Atoms cannot combine to form molecules
• Atoms are made up of protons, neutrons, and electrons
• Atoms are the smallest units of matter
• Atoms are indivisible

What is the atomic number of an element based on?

• The total number of subatomic particles
• The number of neutrons
• The number of electrons
• The number of protons

Which of the following particles is positively charged and found in the nucleus of an atom?

• Isotopes
• Protons
• Electrons
• Neutrons

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

• Protons have no mass
• Protons are lighter than neutrons
• Protons and neutrons have approximately the same mass
• Protons are heavier than neutrons

What is the primary function of neutrons within the nucleus of an atom?

• To determine the atomic number
• To orbit the nucleus
• To stabilize the nucleus
• To provide a positive charge

What distinguishes isotopes of an element from one another?

• Different atomic numbers
• Different numbers of neutrons
• Different numbers of electrons
• Different numbers of protons

How does the arrangement of electrons in an atom influence its chemical properties?

• It has no impact on chemical properties
• It affects the atom's charge
• It determines the mass of the atom
• It influences how the atom bonds with other atoms

Which of the following correctly describes the relationship between protons and electrons in a neutral atom?

• Protons and electrons are not related
• The number of protons equals the number of electrons
• Electrons are greater in number than protons
• Protons are greater in number than electrons

In the Bohr model of the atom, how are electrons depicted?

• As orbiting in distinct energy levels
• As stationary within the nucleus
• As particles moving randomly
• As clouds surrounding the nucleus

Which statement best describes the quantum mechanical model of the atom?

• Electrons exist in defined shells
• Electrons are stationary within the nucleus
• Electrons orbit the nucleus in fixed paths
• Electrons are found in probability clouds around the nucleus