Subatomic Particles and Isotopes

The video tutorial on atomic structure covers the role of protons in determining atomic number, the concept of net charge and mass number, and the formation of ions. It explains how electrons balance charge and the importance of neutrons in stabilizing the nucleus. The tutorial also discusses isotopes, atomic mass, and concludes with an activity for students to apply their knowledge.

What determines the atomic number of an element?

• The number of electrons

• The number of neutrons

• The number of protons

• The total mass of the atom

Which subatomic particle has no charge but a mass of one?

• Photon

• Electron

• Neutron

• Proton

What is an ion?

• An atom with a net charge

• An atom with no protons

• An atom with equal protons and electrons

• An atom with more neutrons than protons

Why are neutrons important in the nucleus?

• They have no significant role

• They act as a glue to stabilize the nucleus

• They provide a positive charge

• They determine the atomic number

What is an isotope?

• An element with a different number of electrons

• An element with a different number of neutrons

• An element with a different number of protons

• An element with a different atomic number

Which of the following is a stable isotope of lithium?

• Lithium-5

• Lithium-9

• Lithium-8

• Lithium-6

What is the role of carbon-14 in science?

• To stabilize carbon atoms

• To date ancient artifacts

• To measure the mass of atoms

• To determine the atomic number

How many protons and neutrons does carbon-12 have?

• 7 protons and 7 neutrons

• 6 protons and 7 neutrons

• 6 protons and 6 neutrons

• 7 protons and 6 neutrons

What is the atomic mass unit (amu) based on?

• The mass of a neutron

• One-twelfth the mass of carbon-12

• The mass of an electron

• The mass of a proton

Which carbon isotope is unstable and used for dating?

• Carbon-12

• Carbon-13

• Carbon-14

• Carbon-15