atOM

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

• Protons, positrons, neutrons
• Protons, electrons, neutrons
• Protons, neutrons, electrons
• Electrons, neutrons, photons

Which subatomic particle has a relative mass of 1 atomic mass unit (amu) and a positive charge?

• Electrons
• Protons
• Positrons
• Neutrons

How many protons does hydrogen have, leading to its atomic number of 1?

• Zero
• One
• Two
• Three

What is the role of neutrons in the nucleus of an atom?

• Stabilize the nucleus
• Create chemical bonds
• Determine the atomic number
• Generate energy

How do isotopes of an element differ from each other?

• In the number of protons
• In the number of energy levels
• In the number of electrons
• In the number of neutrons

Which subatomic particle has a much smaller mass compared to protons and neutrons and is negatively charged?

• Protons
• Electrons
• Neutrons
• Positrons

Why is the number of electrons in an atom equal to the number of protons?

• To form chemical bonds
• To create isotopes
• To maintain charge balance
• To increase atomic mass

Which models are used to visualize the arrangement of protons, neutrons, and electrons in an atom?

• Quantum mechanical model only
• Bohr model only
• Quantum mechanical model and Bohr model
• Wave-particle duality model

What does the structure of an atom consist of?

• Only electrons and neutrons
• Only protons and electrons
• Only protons and neutrons
• Protons, neutrons, and electrons

What is the main purpose of understanding the structure of an atom in chemistry?

• To study historical events
• To design computer software
• To explain the behavior of matter
• To predict weather patterns