Understanding Atomic Structure and Isotopes

The video tutorial explains the structure of an atom, detailing the roles of protons, neutrons, and electrons. It covers key experiments that led to the discovery of these particles and describes the concepts of atomic number, mass number, and isotopes. The tutorial also provides examples of elements and their isotopes, illustrating how atomic mass is calculated as a weighted average of naturally occurring isotopes.

Which subatomic particle was discovered through Thompson's cathode ray tube experiment?

• Proton

• Electron

• Photon

• Neutron

What is the charge of the nucleus of an atom?

• Negative

• Positive

• Variable

• Neutral

How is the atomic number of an element determined?

• By the atomic mass

• By the number of electrons

• By the number of neutrons

• By the number of protons

What is the mass number of an atom?

• The sum of protons and neutrons

• The number of electrons

• The number of protons

• The atomic number

What are isotopes?

• Atoms with the same number of protons but different numbers of neutrons

• Atoms with the same number of electrons but different atomic masses

• Atoms with the same atomic mass but different atomic numbers

• Atoms with the same number of neutrons but different numbers of protons

Which isotope of lithium is more stable?

• Lithium-9

• Lithium-6

• Lithium-7

• Lithium-8

What does the atomic mass of an element represent?

• The mass of the lightest isotope

• The mass of the heaviest isotope

• The average mass of all isotopes

• The mass of the most abundant isotope

Where is the atomic number placed in the periodic table?

• At the bottom of the element symbol

• At the top of the element symbol

• To the left of the element symbol

• To the right of the element symbol

Which element has an atomic number of 8?

• Helium

• Chlorine

• Oxygen

• Carbon

What is the atomic mass of chlorine as listed in the periodic table?

• 33.453

• 34.453

• 36.453

• 35.453