Exploring Rational Expressions: Addition and Subtraction

The lecture covers atomic structure, focusing on subatomic particles like protons, electrons, and neutrons. It explains their charges and roles in the atom. The lecture also discusses radiation types, such as gamma, alpha, and beta particles, and their properties. The structure of the nucleus and the forces holding it together are explored, along with the concept of isotopes and atomic mass calculations. Rutherford's gold foil experiment is highlighted for its impact on the atomic model. Finally, the lecture explains how to calculate weighted averages for isotopes.

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

• Protons, Neutrons, and Photons

• Protons, Neutrons, and Electrons

• Electrons, Neutrons, and Quarks

• Protons, Electrons, and Quarks

Tags

NGSS.MS-PS1-1

Which subatomic particle has a charge of minus one?

• Proton

• Positron

• Neutron

• Electron

What is the charge of a gamma radiation particle?

• Positive 2

• Negative 1

• Zero

• Positive 1

Which particle is described as an extremely fast electron?

• Gamma particle

• Neutron

• Beta particle

• Alpha particle

What holds the protons and neutrons together in the nucleus?

• Weak nuclear forces

• Electromagnetic forces

• Gravitational forces

• Strong nuclear forces

What is the ratio of protons to neutrons in a stable nucleus?

• 3:1

• 1:2

• 2:1

• 1:1

What are isotopes?

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

• Elements with the same number of electrons but different numbers of protons

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

• Elements with the same atomic mass but different atomic numbers

Which isotope of carbon is used for radioactive dating?

• Carbon-14

• Carbon-13

• Carbon-15

• Carbon-12

Why are atomic masses on the periodic table not whole numbers?

• They are calculated using half-lives

• They are averages of the masses of all isotopes

• They include the mass of electrons

• They are rounded to the nearest decimal

How is the atomic mass of an element calculated?

• By measuring the mass of a single atom

• By averaging the atomic numbers of its isotopes

• By adding the masses of protons and neutrons

• By calculating the weighted average of its isotopes