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Atoms III

Across
physical theory of the composition of matter common materials are composed of molecules, which are composed of atoms, which are composed of nuclei and electrons.
elements on the periodic table that are good conductor of heat and shiny
elements on the periodic table that are poor conductors of heat
a pure substance that cannot be separated into simpler substances by physical or chemical means
the area surrounding the nucleus that houses the electrons
table used to organize all elements found on Earth. Elements are organized according to their atomic number, or number of protons. Elements are grouped into groups and periods according to properties.
smallest component of an element having the chemical properties of the element
a subatomic particle of the nucleus of an atom that is without charge and contributes to the mass of an atom
horizontal rows on the periodic table
the number of both protons and neutrons in the nucleus
Down
the number of protons in the nucleus
elements on the periodic table that have properties of both metals and nonmentals
an element with a different number of neutrons
the overall charge of an atom (can be positive or negative)
vertical columns on the periodic table
the small, dense center of an atom that houses the protons and neutrons
a positively-charged subatomic particle of the nucleus of an atom; contributes to the mass of the atom
the orbitals that hold a specific number of electrons (1st energy level holds 2 electrons, 2nd energy level holds up to 8 electrons, etc)
a negatively-charged subatomic particle of the electron cloud; involved in the formation of chemical bonds