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PERIODIC TABLE ELEMENTS INVESTIGATIVE SCIENCE Name_____________________________ ATOMS & THE PERIODIC TABLE Prd.________Date__________________ Three fundamental particles pf the atom are the ______________, ________________, and _______________. At the center of each atom lies the atomic __________________, which consists of _____________and__________. The atomic number refers to the number of ______________ in the nucleus of the atom. Atoms typically have the same number of electrons as the number of protons. All atoms of the same element have the same number of _______________, hence the atomic number that is designated for that element. Isotopes are atoms of a particular element that have the same number of ______________, but a different number of ________________. Therefore, isotopes have a different atomic mass than the typical atom of that element. An isotope is identified by its atomic mass number, which is the total number of both ___________and _____________in the nucleus. An atom of carbon that has 6 ___________and 6 ___________is identified as carbon-12, where 12 is the atomic mass number. A carbon isotope known as carbon-13 would have 6 protons and __________neutrons. A carbon isotope having 6 ____________and 8 neutrons is known as carbon-14. COMPLETE THE FOLLOWING TABLE: (NOTE: USE THE INFORMATION FOR EACH ELEMENT SHOWN ON THE BACK→) ISOTOPE NUMBER OF ELECTRONS Hydrogen-1 1 Chlorine-36 NUMBER OF PROTONS 17 Nitrogen-14 Potassium-40 Arsenic-75 7 19 33 Gold-197 1. 2. 3. 4. NUMBER OF NEUTRONS 118 If an atom of gold loses a proton, is it still gold? Why or why not? ______________________________________________________________________________________ ______________________________________________________________________________________ Which has more mass, a helium atom or a neon atom? _____________How do you know? ______________________________________________________________________________________ Some rare atoms of hydrogen have an atomic mass of 2 or 3 amu (amu = atomic mass units). What term would you use to describe these atoms? ___________________What would cause them to have a greater atomic mass than a normal hydrogen atom? ______________________________________________________________________________________ ______________________________________________________________________________________ 5. A particular atom of Carbon has an atomic mass of 14. Is this atom an isotope? ________________ How many protons does this atom of Carbon have? _________How many neutrons? ____________ 5. How many neutrons does an atom of uranium have? ___________ 6. If an atom of oxygen has an atomic mass of 15, how many neutrons does it have?
