Observing God's World 6th grade Chapter 6 Checkup
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
