Atoms and Their Subatomic Particles Explained

The video explains that all matter is composed of atoms, which are too small to be seen with the naked eye. Atoms consist of subatomic particles: protons, neutrons, and electrons. Protons have a positive charge, neutrons are neutral, and electrons have a negative charge. The nucleus, containing protons and neutrons, is positively charged, while electrons orbit around it. Atoms are electrically neutral as the number of protons equals the number of electrons. The proton number, or atomic number, identifies elements and equals the number of electrons. The nucleon number, or mass number, is the sum of protons and neutrons, determining atomic mass.

What is the fundamental building block of all matter?

• Compounds

• Cells

• Atoms

• Molecules

Which subatomic particle has a negative charge?

• Neutron

• Proton

• Photon

• Electron

What is the relative mass of a neutron?

• 2

• 1

• 0

• 1 per 1840

Where are protons and neutrons located in an atom?

• In the outer shell

• Orbiting the nucleus

• In the electron cloud

• In the nucleus

Why is an atom electrically neutral?

• Because it has no charged particles

• Because it has more protons than electrons

• Because it has equal numbers of protons and electrons

• Because it has more electrons than protons

What does the proton number of an element indicate?

• The atomic mass

• The number of protons

• The number of electrons

• The number of neutrons

What is another name for the proton number?

• Mass number

• Atomic number

• Electron number

• Nucleon number

Which element has a proton number of 6?

• Nitrogen

• Oxygen

• Hydrogen

• Carbon

What does the nucleon number represent?

• The total number of neutrons

• The total number of protons and electrons

• The total number of protons and neutrons

• The total number of electrons

In the notation AZX, what does 'A' stand for?

• Proton number

• Nucleon number

• Electron number

• Atomic number