vân lơp

What are the three main subatomic particles of an atom?

• Protons, neutrons, and electrons
• Protons, electrons, and photons
• Neutrons, electrons, and positrons
• Protons, neutrons, and muons

How does the number of protons affect an element?

• It changes the element's mass
• It alters the element's state of matter
• It determines the element's atomic number
• It affects the element's color

How many protons does hydrogen have?

• Two
• Four
• One
• Three

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

• Protons are heavier
• They have the same mass
• Protons are lighter
• Protons have no mass

What is an isotope?

• Atoms with the same number of protons but different numbers of neutrons
• Atoms that are chemically identical
• Atoms with different numbers of protons
• Atoms with the same number of neutrons but different numbers of electrons

Which of the following best describes electrons in an atom?

• They have a positive charge
• They have the same mass as protons
• They are found in the nucleus
• They orbit the nucleus in energy levels

Which of the following best describes electrons?

• They are positively charged
• They are found in the nucleus
• They orbit the nucleus
• They have the same mass as protons

Why are electrons important for an element?

• They define the element's color
• They stabilize the nucleus
• They are responsible for the element's chemical properties
• They determine the element's atomic mass

What is the main difference between the Bohr model and the quantum mechanical model?

• The Bohr model shows fixed orbits, while the quantum model shows probability clouds
• The Bohr model includes neutrons, while the quantum model does not
• The Bohr model is outdated, while the quantum model is modern
• The Bohr model applies only to hydrogen, while the quantum model applies to all elements

How does the arrangement of subatomic particles affect an element?

• It determines the element's atomic mass
• It affects the element's temperature
• It defines the element's color
• It gives each element its unique properties