Parts of an Atom



Parts of an AtomName _____________________________ Per ______Mrs. ZeidersThe top number in a square on the periodic table of elements is called the Atomic number. The Atomic number tells you how many protons there are in the element. Each element has a unique number of protons which identifies itPart One: How Many Protons? Protons have a __________________ charge. Which element has the most protons? _______________________How many does it have? _________Which element has the smallest number of protons? _______________ How many does it have? _________Which element has 45 protons? ____________________Protons are located in the nucleus and contribute to the atomic mass of the atom. The other particle that contributes to the mass of the atom is: _________________.The Atomic Mass tells you the mass of the protons and neutrons in the atom in atomic mass units (amu’s). This is the other number located on the bottom of the square in the periodic table. What is the atomic mass of Germanium (Ge)? ______________________Part 2: How many Electrons? The periodic table displays neutral elements. Meaning they do not have an overall positive or negative charge, they are neutral. Their protons _______________________their electrons. So however many protons and atom has, it has an______________________. (Later this will change when we learn about …__________ - atoms with a + or – charge due to an imbalance of their protons and electrons.)What charge does an electron have? ___________________How many electrons does Calcium have? _________________Which element has 25 electrons? ___________________________ How much does an electron weigh? ___________________________3Li6.941LithiumPart 3: How many Neutrons? What charge does a neutron have? ____________________How much does a neutron weigh? ______________________ is the atomic mass rounded to the nearest whole number and tells us how many ____________________(or items) are in the nucleus. Lithium has a mass number of 7, this mass number tells us that Lithium has seven particles in its nucleus (protons + neutrons). Since the atomic mass of 6.941 amu , we round this to 7 to get the “mass number”And the atomic number tells us there are only ___________ protons…We subtract ______ from ______ to find the number of neutrons…. ____________________ neutronsNow you compare these two atoms:6C12.011Carbon8O15.999OxygenHow many neutrons is in Carbon? ___________How many neutrons are in oxygen? ____________The fact that some atomic masses are not close to whole numbers is explained by the fact that the number of neutrons are not the same in all the atoms of a given element. Isotopes: Parts of the Atom PracticeName _____________________________ Per ______Mrs. Zeiders12Mg24.305MagnesiumLabel this diagram:Fill in this table with the appropriate information:NameAtomic symbolAtomic mass (amu)Mass numberAtomic number# of protons# of electrons# of neutrons(other option?)SodiumNa22.992311111112 (11)B563139 (38)89392935 (34)9843Pb207.27088Mo54 (53)474.92 ................
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