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Name:_____________________________ Date:______________________ Pd:_____ Elements, Atoms, Particles & the Periodic Table Guided Notes Elements & Atoms All elements are composed of tiny indivisible particles called ________________. List at least three different elements by name and symbol: 1. ______________ & _____ 2. ______________ & _____ 3. ______________ & _____ Atoms of the same element are ________________. This means that the atoms of any one element are _________________ than those of any other element. Atoms of different elements can _______________ ___________ together, or can _________________ ______________ in simple ratios to form compounds. Atomic Structure What are the names of the three primary particles that make up an atom? _____________________ _____________________ _____________________ Protons ___________ Charged (+1) Mass of ______________ Found in the ________________ The number of protons determines the ATOMIC NUMBER of an atom. The number of protons DEFINES the element! (These are BOLD because they are important!) How many protons does Carbon have? _____________ How many does Helium have? ______________ Which element has 11 protons? __________________ Neutrons ______________ Charge (0 Charge) Mass of _______________ Found in the ________________ The number of neutrons PLUS the number of protons EQUALS an atom’s atomic mass. # of neutrons + # of protons = atomic mass The number of neutrons can vary! Isotope = ______________________________________________________________________ Draw the two most common isotopes of Carbon (C) with Mr. Redies: Electrons ______________ Charge (-1) Mass of ______________ (has almost no mass) Found in energy levels or ____________. For right now, the # of electrons = ________________ The first energy level can hold _____ electrons, later levels can hold _____. How many electrons does Gold (Au) contain? 1. Find the element on the periodic table: Row = _________ Column:_________ 2. What is the atomic number (big number)? _________________ 3. How many protons does it have?_____________ 4. How many electrons must it also have?____________ Periodic Table Elements on the periodic table are arranged by ____________ ______________, or the number of ________________. The periodic table gives the average _________ __________, of the most common isotope. You can use the periodic table to determine how many protons, neutrons, & electrons each atom has.