Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. How does the number of electrons relate to the number of protons in an atom?
   • In an atom the number of electrons is equal to the number of protons in the nucleus.
2. What is the overall electrical charge of an atom?
   • Atoms have no overall electrical charge.
3. What do all atoms of a particular element have in common? What do we call this number?
   • All atoms of a particular element have the same number of protons. The number of protons in an atom of an element is called its atomic number.
4. What does the mass number of an atom refer to?
   • The mass number of an atom is the total number of protons and neutrons.
5. How can atoms be represented?
   • Atoms can be represented as shown in this example: (Mass number) (Atomic number) 23 11 Na
6. What is an isotope?
   • An isotope is a version of an element that has the same number of protons to normal but a different number of neutrons.
7. How can an atom become a positive ion?
   • Atoms turn into positive ions if they lose one or more outer electron(s).
8. What is an isotope?
   • Isotopes are atoms of an element with the normal number of protons and electrons, but different numbers of neutrons. Isotopes have the same atomic number, but different mass numbers.