Physical Science 8 th
Grade
Test #2: Atoms and Atomic Theory/Periodic Table
STUDY GUIDE
Name: ____________________________ Segment: _____ Date: _________________
1) What area/region of an atom makes up the mass of the atom?
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2)
What area/region of an atom makes up the largest part of an atom’s volume?
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3) Why are elements grouped together on the Periodic Table?
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4) The elements on the Periodic Table are arranged by
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5) Which two subatomic particles are located inside the nucleus of an atom?
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6) What holds the atoms of a molecule together? __________ Bonds.
7) What is the key (main) difference that causes atoms of one element to differ from atoms of other elements?
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8) Approximately how many elements are in the periodic table? _______
9) A neutral (balanced) atom has an atomic number of 20, and a mass number of 42. How many electrons does the atom have? ______________ How many neutrons does the atom have? ___________ How many protons? _______________.
10) In what order are the regions arranged on the periodic table when you read it from left to right? Put these three regions in the correct order: metalloids, non-metals, and metals.
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11) Which group/family of elements are the most unstable/reactive? _________________
12) Why are the halogen group/family of elements more unstable than the Noble Gases? Explain.
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13) A particle made of two or more elements (atoms) chemically bonded together is a _________________.

14) The atomic number tells us how many _____________ an element (atom) has.
15) Which classification of elements have the following properties: dull, brittle, and poor conductors?
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16) Which classification of elements have the following properties: shiny, malleable, and good conductors?
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17) A horizontal row of elements on the Periodic Table is called a _________________.
18) A vertical column of elements on the Periodic Table, having similar properties, is called a _________, or a __________.
19) The charge of an electron is _______________.
20) The charge of a neutron is ________________.
21) The charge of a proton is _______________.
22) Water (H
2
O) is made from hydrogen and oxygen atoms. Two atoms of hydrogen, and one atom of oxygen come together in a chemical reaction, to form a ________________ of water. Since these are two gases forming a chemical bond, what type of bond holds the atoms together? _________________.
23) Table salt, NaCl, is a metal and a gas bound together through a chemical reaction. What type of bond holds these atoms together? _______________________________
24) On a separate sheet of paper, create a model of an atom, showing the nucleus, protons, neutrons, energy levels/rings, electrons, and the appropriate charges. Staple the sheet of paper onto this study guide.
25) Look at Carbon on a Periodic Table. What is its Atomic #: _______ Symbol: ______ Atomic Mass #:
_____
26)
Draw a Bohr’s Model for Carbon on your notebook paper attached to this study guide.
27) Draw a Lewis Dot Structure/Electron Dot Diagram of Carbon on your notebook paper.
28) Consider the molecule, ZnCl
2.
How many different elements make up this molecule? ______ How many total atoms are bound together to create this molecule? _________
29) Consider 2H
2
0. How many total atoms are in this chemical equation? ____________
30) Is the following chemical equation balanced? Meaning, are the same number of atoms in the reactant side, as in the product? H
2
CO
3
H
2
O + CO
2 ____________________________
31) Explain the specific law that tells us why chemical equations must be balanced.
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32) How many neutrons are in the isotope, Boron-11? ____________