Atomic Structure and Periodic Table Quiz

Atomic Structure and Properties

• The isotope of an element is defined by the number of neutrons present in the nucleus of an atom.
• Atoms cannot be seen with conventional microscopes because they are extremely small, with sizes measured in picometers (10^-12 meters).
• Chemical elements are distinguished from each other by the number of protons present in the nucleus of an atom, known as the atomic number.
• The nucleus of an atom contains approximately 99.9% of the atom's total mass.
• Accurately predicting the behavior of atoms using classical physics is impossible because atoms exhibit wave-like behavior and possess quantized energy levels, which are principles of quantum mechanics.