The video tutorial explains the structure of an atom, focusing on subatomic particles: electrons, protons, and neutrons. It covers the properties of these particles, their behavior in electric fields, and how they contribute to the atomic number and mass. The concept of isotopes is introduced, and practice problems are provided to reinforce understanding.

Which subatomic particle has a negligible mass?

• Proton

• Nucleus

• Neutron

• Electron

What is the charge of a proton?

• Variable

• Neutral

• Positive

• Negative

In an electric field, which plate would an electron be attracted to?

• Both plates

• Negative plate

• Neither plate

• Positive plate

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What must be equal in an atom to maintain its neutrality?

• Electrons and neutrons

• Protons and neutrons

• Protons and electrons

• Protons and atomic number

What does the atomic number of an element represent?

• Number of electrons

• Atomic mass

• Number of protons

• Number of neutrons

If an atom has 11 protons, how many electrons does it have?

• 11

• 13

• 12

• 10

How do you calculate the number of neutrons in an atom?

• Atomic number minus mass number

• Protons plus electrons

• Protons minus electrons

• Mass number minus atomic number

What defines isotopes of the same element?

• Same number of electrons, different protons

• Same atomic mass, different protons

• Same number of protons, different neutrons

• Same number of neutrons, different protons

How many neutrons does Carbon-14 have?

• 6

• 8

• 14

• 12

What is the atomic number of silicon?

• 28

• 14

• 16

• 12