Atomic Structure and Subatomic Particles

This video, presented by Rebecca from ChemistryIsMyJam.com, introduces Unit 2, focusing on the atom. It covers the parts of the atom, including protons, neutrons, and electrons, and discusses the limitations of the atomic model. The video explains the concept of atomic mass, the significance of protons in determining elements, and how to calculate the mass number by adding protons and neutrons. It also highlights the differences between elements based on the number of protons and provides examples using the periodic table.

What is the central part of an atom called?

• Neutron

• Proton

• Nucleus

• Electron cloud

Which subatomic particle has no charge?

• Proton

• Electron

• Neutron

• Photon

What is the approximate mass of an electron compared to a proton?

• 1/2 of a proton

• Twice the mass of a proton

• Equal to a proton

• 1/1800 of a proton

What determines the element of an atom?

• Atomic mass

• Number of neutrons

• Number of electrons

• Number of protons

What is the atomic number of gold?

• 44

• 6

• 79

• 11

What is the significance of the atomic number on the periodic table?

• It defines the element by the number of protons

• It indicates the number of neutrons

• It shows the number of electrons

• It represents the atomic mass

How do you calculate the mass number of an atom?

• Protons plus electrons

• Electrons only

• Neutrons plus electrons

• Protons plus neutrons

If an atom of carbon has a mass number of 13, how many neutrons does it have?

• 6

• 12

• 13

• 7

What is the mass number of an atom with 5 protons and 6 neutrons?

• 11

• 10

• 5

• 6

Why is the mass of electrons often ignored when calculating atomic mass?

• They are too small

• They are too large

• They have no charge

• They are not part of the atom