4.1.2 Atomic Number and Mass Number

    Cards (32)

    • What is an atom composed of?
      Protons, neutrons, electrons
    • Electrons have a negative charge and are located in orbitals
    • Neutrons are located in the nucleus and have a neutral charge.
    • Match the atomic component with its charge:
      Proton ↔️ Positive
      Neutron ↔️ Neutral
      Electron ↔️ Negative
    • What does the atomic number (Z) represent?
      Number of protons
    • The atomic number is crucial because it identifies the element
    • Oxygen has an atomic number of 8, meaning it has 8 protons in its nucleus.
    • What is the mass number (A) of an atom?
      Sum of protons and neutrons
    • Carbon-12 has 6 protons and 6 neutrons, resulting in a mass number of 12.
    • Steps to calculate the number of neutrons in an atom
      1️⃣ Identify A and Z
      2️⃣ Apply the formula N=N =AZ A - Z
    • What are isotopes of an element?
      Same protons, different neutrons
    • Isotopes are denoted using the format ZAX^{\text{A}}_{\text{Z}}X where AA is the mass number, Z</latex> is the atomic number, and XX is the element symbol.
    • What does the atomic number (Z) represent in an atom?
      Number of protons
    • To find the number of neutrons (N), you subtract the atomic number (Z) from the mass number (A)
    • Calculate the number of neutrons in carbon-14, where A = 14 and Z = 6.
      8 neutrons
    • The number of neutrons in carbon-14 is 8.
    • Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons
    • What does the symbol A represent in the isotope notation ZAX^{\text{A}}_{\text{Z}}X?

      Mass number
    • Carbon-12 has 6 protons and 8 neutrons.
      False
    • What are the three main components of an atom?
      Protons, neutrons, electrons
    • Match the atomic component with its properties:
      Protons ↔️ +1 charge, nucleus
      Neutrons ↔️ 0 charge, nucleus
      Electrons ↔️ -1 charge, orbitals
    • Where are electrons located in an atom?
      Orbitals around the nucleus
    • The atomic number of oxygen is 8, which means it has 8 protons
    • The atomic number is unique for each element.
    • What is the mass number (A) of an atom equal to?
      Protons + neutrons
    • What is the mass number of carbon-12, which has 6 protons and 6 neutrons?
      12
    • The mass number is the same for all isotopes of an element.
      False
    • How do you calculate the number of neutrons in an atom using its mass number (A) and atomic number (Z)?
      N = A - Z
    • To find the number of neutrons, you subtract the atomic number from the mass number
    • The atomic number uniquely identifies an element.
    • What is the atomic number and mass number of helium, as shown in the example?
      Z = 2, A = 4
    • Calculate the number of neutrons in sodium, which has an atomic number of 11 and a mass number of 23.
      12 neutrons
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