2.1 Constituents of the atom

• Match the subatomic particle with its properties:

  Proton ↔️ Charge +1, mass 1 u, nucleus

  Neutron ↔️ Charge 0, mass 1 u, nucleus

  Electron ↔️ Charge -1, mass 1/1836 u, orbitals
• Arrange the following atomic components from heaviest to lightest:

  1️⃣ Protons and neutrons

  2️⃣ Electrons
• Protons are positively charged particles located in the nucleus
• Match the property of a proton with its value:

  Charge ↔️ +1

  Mass ↔️ 1 u

  Location ↔️ Nucleus
• An atom is the smallest unit of matter that retains the chemical properties of an element.


  True
• Electrons orbit the nucleus in fixed circular paths.

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

  Protons, neutrons, electrons
• Electrons orbit the nucleus in specific shells or orbitals.


  True
• The protons and neutrons form the dense central core known as the nucleus
• Neutrons have a charge of 0 and a mass of approximately 1 u.


  True
• What are the two key structures of an atom?

  Nucleus and electron shells
• Match the atomic component with its contents and location:

  Nucleus ↔️ Protons and Neutrons, Center of the atom

  Electron Shells ↔️ Electrons, Orbiting the nucleus
• What does the atomic number of an atom represent?

  Number of protons
• The atomic number uniquely identifies an element.


  True
• Electrons have a mass approximately equal to protons.

  False
• Neutrons are located in the nucleus
• What is the charge of a neutron?

  0
• Protons and neutrons form the dense central core known as the nucleus
• What is the mass of a proton in atomic mass units (u)?

  1 u
• What is the charge of a neutron?

  0
• What is the charge of an electron?

  -1
• What is the maximum number of electrons the first electron shell can hold?

  2
• Arrange the electron shells in order of their maximum number of electrons from smallest to largest:

  1️⃣ Shell 1 (2 electrons)

  2️⃣ Shell 2 (8 electrons)

  3️⃣ Shell 3 (8 electrons)
• The mass number of an atom is the sum of protons and electrons in the nucleus.

  False
• An atom is the smallest unit of matter that retains the chemical properties of an element
• Neutrons are neutral particles located in the nucleus
• The mass of an electron is equal to the mass of a proton.

  False
• Protons have a mass of approximately 1 atomic mass unit (u).


  True
• Neutrons have a charge of 0
• Protons have a positive charge and are located in the nucleus
• Protons are positively charged particles located in the nucleus
• Protons are positively charged particles located in the nucleus
• Match the subatomic particle with its charge and location:

  Proton ↔️ +1, Nucleus

  Neutron ↔️ 0, Nucleus

  Electron ↔️ -1, Orbitals
• What is the approximate mass of a proton in atomic mass units (u)?

  1 u
• Electrons have a negative charge and a mass of approximately 1/1836
• The first electron shell can hold up to two electrons.


  True
• The mass number of an atom is the total number of protons and neutrons
• What is the smallest unit of matter that retains the chemical properties of an element?

  Atom
• Protons and neutrons are found in the nucleus
• Where are protons located in the atom?

  Nucleus