1.1 Atoms, elements, and compounds

• The charge of a proton is positive
• Arrange the subatomic particles based on their mass from heaviest to lightest:

  1️⃣ Proton

  2️⃣ Neutron

  3️⃣ Electron
• Carbon has an atomic number of 6
• Examples of elements include hydrogen, oxygen, and gold
• Oxygen has an atomic number of 8
• What is the mass number of carbon-12?

  12
• Gold is highly inert and conductive
• Match the subatomic particle with its location in the atom:

  Proton ↔️ Nucleus

  Electron ↔️ Orbits the nucleus
• Match the subatomic particle with its function:

  Proton ↔️ Determines atomic number

  Electron ↔️ Involved in bonding
• Match the atomic property with its example:

  Atomic number ↔️ Carbon has 6 protons

  Mass number ↔️ Carbon-12 has mass 12
• Arrange the subatomic particles based on their location in an atom:

  1️⃣ Protons in the nucleus

  2️⃣ Neutrons in the nucleus

  3️⃣ Electrons in shells
• What is the mass number of an atom?

  Total protons and neutrons
• An element is a pure substance consisting of only one type of atom
• Match the property with the correct item:

  Atom ↔️ Smallest unit of an element

  Element ↔️ Pure substance of identical atoms
• What subatomic particles are found in the nucleus of an atom?

  Protons and neutrons
• The three main subatomic particles are protons, neutrons, and electrons
• Match the property with the correct item:

  Element ↔️ One type of atom

  Compound ↔️ Multiple types of atoms
• Which subatomic particle adds mass to the nucleus and helps stabilize it?

  Neutron
• What is an element defined as?

  Pure substance of one atom
• Gold is known for being highly inert and conductive.
• Water (H₂O) is a compound formed from hydrogen and oxygen atoms.


  True
• Atoms in compounds are held together by chemical bonds.

  True
• What does the nucleus of an atom contain?

  Protons and neutrons
• What is the smallest unit of an element that retains its chemical properties?

  Atom
• Neutrons add mass to the nucleus and help stabilize it

  True
• What is the atomic number of an element defined as?

  Number of protons
• What is an element defined as?

  Pure substance of atoms
• The atomic number of an element is unique and determines its identity

  True
• The mass number of an atom is the total number of protons and neutrons
• What is the atomic number of hydrogen?

  1
• What holds the atoms together in a compound?

  Chemical bonds
• Electrons are negatively charged and orbit the nucleus in shells
• Match the subatomic particle with its property:

  Proton ↔️ Positive charge

  Neutron ↔️ Neutral charge

  Electron ↔️ Negative charge
• An element is a pure substance consisting of only one type of atom
• Hydrogen is the lightest and most abundant element.

  True
• What is a compound formed from?

  Two or more elements
• Compounds are formed when elements combine in fixed proportions.
• Why do elements in the same group share similar chemical properties?

  Same valence electrons
• The mass number of an atom is the sum of its protons and neutrons.
• Compounds have properties identical to their constituent elements.

  False