Isotopes and Ions

• Isotopes

  Isotopes of an element have the same number of protons, but different numbers of neutrons in their nuclei. Isotopes of an element have:

  • the same atomic number
  • different mass numbers
• Isotopes of hydrogen

  All hydrogen atoms contain one proton (and one electron), but they can contain different numbers of neutrons. Hydrogen-1 is the most abundant isotope of hydrogen.
• Hydrogen istopes

  A) 1

  B) 1

  C) 2-1=1

  D) 1

  E) 1

  
• IonsIons are charged particles formed when atoms, or groups of atoms, lose or gain electrons:

  • positively charged ions form when electrons are lost
  • negatively charged ions form when electrons are gained