Observing God's World 6th grade Chapter 6 Checkup

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chromium

"chrome'; a shiny metal often applied to polish steel to prevent it from rusting

periodic table of elements

a chart constructed by Dmitri Mendeleev to arrange the elements in such a way as to group similar elements together

combustion

a chemical reaction in which a substance reacts rapidly with oxygen

nitrogen

a colorless and odorless gas used in chemical factories and as rocket fuel

ionic compound

a compound composed of charged atoms or groups of atoms

molecular compound

a compound composed of individual molecules

molecule

a group of two or more atoms bound together

fluorine

a halogen used in toothpaste, coolants, Teflon, and high-powered military lasers

diamond

a hard, crystalline form of carbon that is the hardest of all known minerals

metals

a large group of elements that are typically shiny, with a silvery color, and are good conductors of electricity

weight

a measure of the pull of gravity on an object

zinc

a metal often used to coat steel to prevent it from rusting; also used in flashlight batteries

iodine

a nonmetal and halogen that is purple solid at room temperature

neutrons

a particle that helps make up the nucleus of an atom

protons

a positively charged particle that helps make up the nucleus of an atom

chemical reaction

a process on which atoms of elements or compounds are rearranged to form new substances

silicon

a semimetal that is an ingredient in sand, quartz, and glass; in pure form, used to make computer chips

iodine

a solid halogen that sublimes when it is heated; used in iodized salt and medical antiseptics

compound

a substance that is composed of more than one type of atom bonded together

element

a substance that is composed of only one type of atom

atoms

a tiny particle from which all substances are composed; the smallest particle of an element

nucleus

a tiny, extremely dense core of an atom

nickels

a very hard metal that is used to make stainless steel, rechargeable batteries, tanks to hold corrosive chemicals, and the five cent coin

sulfur

an odorless, yellow solid called brimstone in the bible; flammable and burns easily

neutral

anything lacking on electrical charge

matter

anything that takes up space and has mass

halogens

elements in the seventh column of the periodic table, such as fluorine and chlorine, that show a special tendency to form compounds with alkali and alkaline earth metals

carbon

found in two forms, graphite an diamond

shell

is formed by electrons that orbits at roughly the same distance from the nucleus

electrons

one of the tiny particles that circle around the nucleus of an atom

most metals are

solids

density

the amount of matter (mass) in one unit of volume (space)

mass

the amount of matter that makes up an object

electron cloud

the cloud like shield around an atom's nucleus formed by the atom's fast-moving electrons; prevents other atoms from moving into the same space

lead

the densest of everyday metals; used to make car and truck batteries, wheel weights, and firearms ammunition

noble gasses

the elements in the last column of the periodic table, such as helium and argon; they do not combine with anything else except under unusual circumstances

chlorine

the most widely used halogen; used in bleach, disinfectants, and pvc; an ingredient in table salt

atomic number

the number of protons in an atom

mercury

the only metal that is liquid at room temperature, ...

chemistry

the study of atoms and molecules

sublime

to turn directly from a solid to a gas


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