Pupil sheet · Inside the atom
Inside the atom — return questions
Name ______________________ Date ____________
Use one to two weeks after the lessons. Keep the notes and the lesson closed.
1. describe
Keep the lesson closed. (a) Define the proton number (atomic number) and the mass number (nucleon number). (b) A sodium atom has proton number 11 and mass number 23. Describe its structure: where each kind of particle is, how many there are, and the relative charge and relative mass of each. (c) State which single change to the atom would turn it into a different element.
2. state / explain
Keep the lesson closed. Potassium has proton number 19. Write the electronic configuration of a potassium atom and of a potassium ion, K+. Use the atom's configuration to state potassium's Group and Period, and say how you know each one.