2.1 Constituents of the atom

• Match the particle with its properties:

  Proton ↔️ +1 charge

  Neutron ↔️ No charge

  Electron ↔️ -1 charge
• What is the charge of a proton?

  +1
• Protons define the atomic number of an element.


  True
• Electrons orbit the nucleus in specific energy levels called electron shells.


  True
• Neutrons add to the atomic mass but do not affect chemical properties.


  True
• What is the charge of a proton?

  +1
• Match the particle with its properties:

  Proton ↔️ Charge of +1

  Neutron ↔️ No charge
• Neutrons have a negligible mass compared to protons.

  False
• What determines the atomic number of an element?

  Number of protons
• Match the hydrogen isotope with its properties:

  Protium ↔️ 1 proton, 0 neutrons

  Deuterium ↔️ 1 proton, 1 neutron

  Tritium ↔️ 1 proton, 2 neutrons
• Electrons usually balance the positive charge of protons in a neutral atom.


  True
• The number of protons in the nucleus defines the element
• What is the charge of a proton?

  +1
• What is the charge of a neutron?

  0
• Electrons are involved in chemical bonding between atoms.


  True
• Match the atomic particle with its property:

  Proton ↔️ Positive charge

  Neutron ↔️ Neutral charge

  Electron ↔️ Negative charge
• Isotopes have the same atomic number but different atomic masses.


  True
• The mass number determines the specific isotope
• An atom is the basic unit of matter that retains the chemical properties of an element
• Protons and neutrons are located in the nucleus
• What is the charge of a neutron?

  0
• What is the charge of an electron?

  -1
• What is the primary role of protons in an atom?

  Define the element
• Protons define the element
• What is the charge of a neutron?

  0
• What is the charge of an electron?

  -1
• Match the particle with its properties:

  Proton ↔️ Positive charge

  Electron ↔️ Negative charge

  Neutron ↔️ No charge
• What are isotopes?

  Variations of an element
• An atom is the basic unit of matter that retains the chemical properties of an element
• Arrange the subatomic particles by their location in an atom:

  1️⃣ Protons in the nucleus

  2️⃣ Neutrons in the nucleus

  3️⃣ Electrons in electron shells
• What is the mass of an electron in atomic mass units (amu)?

  ~0
• The number of protons in the nucleus determines the element
• Neutrons contribute to the atomic mass
• An atom consists of a nucleus surrounded by electrons
• What makes an atom electrically neutral?

  Equal protons and electrons
• Arrange the following properties in the order they are defined:

  1️⃣ Mass number (A)

  2️⃣ Atomic number (Z)
• The nucleus of an atom contains protons and neutrons.


  True
• Electrons have a negligible mass compared to protons and neutrons.


  True
• Atoms are electrically neutral because the number of protons equals the number of electrons
• The nucleus of Helium-4 contains 2 protons and 2 neutrons