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each inner energy level of an atom has a maximum number of____it can hold.
Electrons
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Dot diagrams are used to represent_____.
outer level electrons
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Particals of matter that make up protons and neutrons are____.
quarks
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A chemical symbol represents the ______ of an element.
name
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horizontal rows of the periodic table are called____.
periods
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Atoms of the same element with different numbers of neutrons are called______.
isotopes
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A partical that moves around the nucleus is a a(n)_____.
electrons
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elements that are gases, are brittle, and are poor conductors at room temperature are ___.
nonmetals
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A______is used to acclerate protons in the study of subatomic particals.
tevatron
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A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is_____.
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At room temperature, most metals are___.
solids
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The process by wich solid iodine particals change directly to gas without first becoming a liqid is called____.
sublimation
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Elements that form salts by combining with metals are___.
halogens
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Substances that conduct an electric current only under certain conditions are most likley to be____.
metalliods
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Different forms of the same element that have different properties becouse of different atom arangments are called___.
allotropes
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An allotrope of carbon that is soft and can be used as a lubricant is____.
graphite
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An allotrope of carbon that is hard and is often used in jewelry is____.
diamond
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Hydrogen is grouped with alkali metals becouse it____.
has one electron on its outer energy level.
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A chemical family whose members exist as reactive diatomic molecules in the gaseus phase is the_____.
halogens
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When hydrogen reacts with the active metals, it forms a chemical bond by____.
gaining one electron
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The elements in group 3 through 12 of the periodic table are the ___.
transition elements
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A family of elements that has two electrons in its outer energy level is the____.
alkline earth elements
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Metals can be used as wire becouse they are____.
ductile
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Elements in wich the outer electrons are NOT held tightly are most likley to form______bonds.
metalic
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Bromine is the only halogen and nonmetal that is normally a________.
liquid
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The only metal that is a liquid at room temperature is_____.
mercury
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A synthetic element that is used in smoke detectors is_____.
americium
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All synthetic elements are____.
radioactive
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Cobolt, iron, and nickle are known as the_____triad.
iron
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Three transition elements in group 12 of the periodic table are____.
mercury, zinc, and cadmium
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Any element with an atomic number greater than that of uranium is a a(n)____.
transsuranium element
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The noble gases are in____.
group 18
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elements that lie along the stair-step line of the periodic table are____.
metalliods
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The appearance of solid metals can be decribed as____.
shiny
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A family of elements that contains the most reactive metals is the___.
alkali metals
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Radioactive elements compermise a majority of the____.
actinides
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Explain why noble gases are stable.
They are stable becouse outermost energy level is full.
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Compare the masses of protons, elctrons, and neutrons.
- mass of p-1
- mass of e-0
- mass of n-1
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Give the name for each element:
- Na-Sodium
- Fe-Iron
- W-tungsten
- Ag-Silver
- Sn-Tin
- Sb-
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Wich metal is founded in the largest amount in the human body?
Calcium
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alkaline earth metal
metal
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