ISOTOPE or Different Elements
In each of the following statement, determine if they are different elements (DE) or isotopes (I). HINT: If the
atomic number doesn’t change, it is an isotope.
_______1. Element D has 6 protons and 7 neutrons and Element F has 7 protons and 7 neutrons.
_______2. Element J has 27 protons and 32 neutrons and Element L has 27 protons and 33 neutrons.
_______3. Element X has 17 protons and 18 neutrons and Element Y has 18 protons and 17 neutrons.
_______4. Element T has an atomic number of 20 and atomic mass of 40 and Element Z has an atomic
number of 20 and an atomic mass of 41.
_______5. Element P has an atomic number of 92 and an atomic mass of 238. Element S has 92 protons and
143 neutrons.
Atomic Structure Riddles
Answer the following questions in the space provided using the information given.
_______1. If an oxygen atom has 8 protons and 8 neutrons in the nucleus, what is the mass number of this
oxygen?
_______2. If an oxygen atom has 8 protons and 8 neutrons in the nucleus, what is the atomic number?
_______3. If a neutral atom has 12 electrons, what is the atomic number?
_______4. If a neutral atom has 9 protons in its nucleus, how many electrons must it have?
_______5. Suppose I tell you that the mass number of an atom is 18 and the atom has 8 protons in its
nucleus. What is the number of neutrons?
_______6. A neutral atom has 14 electrons and a mass number of 27. How many neutrons does it have?
_______7. A neutral atom has 17 electrons and a mass number of 35. What is its atomic Number?
_______8. If a neutral atom has 3 protons in its nucleus, how many electrons does it have?
_______9. A neutral atom has sixteen electrons and 18 neutrons. What is its mass number?
_______10. The atomic number of carbon is 6. A well-known isotope of carbon has a mass number of 14.
How many neutrons are found in the atoms of this isotope?