1.2.1 Structure of the Atom

• A chemical element is made of only one kind of atom.

  True
• Which subatomic particle has no charge?

  Neutron
• Electrons orbit the nucleus in specific energy levels called shells
• Match the subatomic particle with its charge:

  Proton ↔️ Positive (+1)

  Neutron ↔️ Neutral (0)

  Electron ↔️ Negative (-1)
• The number of protons in the nucleus determines the element.


  True
• The first electron shell (K) can hold a maximum of 2 electrons.


  True
• A chemical element is composed of only one type of atom.


  True
• Electrons are negatively charged particles that orbit the nucleus.


  True
• What are the distinct energy levels in which electrons orbit the nucleus called?

  Electron shells
• Electrons orbit the nucleus in distinct energy levels called electron shells
• The atomic number is defined as the number of protons
• What happens to atoms to form ions?

  Gain or lose electrons
• A chemical element is made of only one type of atom


  True
• An atom is the smallest particle of a chemical element
• Electrons are negatively charged particles that orbit the nucleus
• What is the charge of an electron?

  Negative (-1)
• What is the smallest particle of a chemical element that retains its chemical properties?

  Atom
• Which two subatomic particles are found in the nucleus of an atom?

  Protons and neutrons
• What are the distinct energy levels in which electrons orbit the nucleus called?

  Electron shells
• What is the smallest particle of a chemical element that retains its chemical properties?

  Atom
• Protons are located in the nucleus
• The overall charge of the nucleus is positive due to the presence of protons.


  True
• What is the overall charge of the nucleus of an atom?

  Positive
• What are electrons in the outermost shell called?

  Valence electrons
• Ions can have a positive or negative charge
• What is the smallest particle of a chemical element that retains its properties called?

  Atom
• Which subatomic particle has no charge?

  Neutron
• What two subatomic particles are found in the nucleus of an atom?

  Protons and neutrons
• The number of valence electrons influences the chemical behavior of the atom.
• Match the characteristics of ions and neutral atoms:

  Ions ↔️ Positive or negative charge

  Neutral Atoms ↔️ No net charge
• The modern atomic model is based on quantum mechanics.


  True
• What is the smallest particle of a chemical element that retains its chemical properties?

  Atom
• What is the charge of a proton?

  Positive (+1)
• Protons and neutrons are both located in the nucleus of an atom.


  True
• Neutrons have a neutral charge and are found in the nucleus.


  True
• Arrange the following in the order of their location within an atom:

  1️⃣ Protons and neutrons in the nucleus

  2️⃣ Electrons in electron shells
• The overall charge of the nucleus is positive and balanced by the negatively charged electrons
• The number of valence electrons influences the chemical behavior
• What is the charge of a proton?

  Positive (+1)
• Which two subatomic particles are housed in the nucleus of an atom?

  Protons and neutrons