Atomic mass

• What are loose electrons?

  Electrons that are not tightly bound
• What is the formula for calculating atomic mass?

  Protons + Neutrons
• What happens when an atom gains electrons?

  It becomes negatively charged
• What is the atomic mass of magnesium (Mg)?

  24
• What is the atomic number of magnesium (Mg)?

  12
• How many protons does magnesium (Mg) have?

  12 protons
• How do you calculate the number of neutrons in magnesium (Mg)?

  24 - 12 = 12 neutrons
• What is the notation for iron (Fe) with atomic mass and number?

  Fe⁵⁶₂₆
• How many protons does iron (Fe) have?

  26 protons
• How many electrons does iron (Fe) have in a neutral state?

  26 electrons
• What is the notation for aluminum (Al) with atomic mass and number?

  Al²⁷₁₃
• How many protons does aluminum (Al) have?

  13 protons
• How many electrons does aluminum (Al) have in a neutral state?

  13 electrons
• What is the notation for nitrogen (N) with atomic mass and number?

  N¹⁴₇
• How many protons does nitrogen (N) have?

  7 protons
• How many electrons does nitrogen (N) have in a neutral state?

  7 electrons
• What is the notation for iron (Fe) as an ion with a different number of electrons?

  Fe⁵⁶₂₆ with 24 electrons
• What does Θ^- represent?

  Loss of electrons
• What does Θ⁺ represent?

  Gain of electrons