More Practice

1) Remove one proton from What is the new symbol? __________

2) If one electron is added to what is the new symbol? __________

3) Add one neutron to What is the new symbol? __________

4) Remove one proton and one neutron from What is the new symbol? __________

5) Remove one neutron from sodium-23. What is the new isotope? __________

6) Please write the symbol for uranium-235, including mass number and atomic number. __________

7) Please write the symbol for boron-10, including mass number and atomic number. __________

8) What is the most common mass number for aluminum? __________

9) How many protons in one atom of potassium-39? __________

10) How many neutrons in an atom of helium-3? __________

11) What is the atomic mass of calcium? __________

12) How many electrons in a neutral atom of silicon-28? __________

13) What is the mass of one molecule of Al(OH)₃? __________

14) What is the mass of one molecule of rust, Fe₃O₄? __________