Substance Melting Point (°C)
being bent in half.
getting cut into two pieces.
In 1982, the composition of US pennies was changed. According to the information in the table, 1985 pennies
are more dense than 1981 pennies.
are less dense than 1981 pennies.
are equal in density to 1981 pennies.
cannot be compared to 1981 pennies
All of the substances on the periodic table are classified as elements because they
are pure substances. are composed of atoms. cannot be broken down into other substances. cannot be dissolved in water or other liquids.
Salt (NaCl) is a common substance. Salt is which of these?
Each element is assigned an atomic number, which is the same as
the number of electrons in the atom's nucleus.
the number of protons in the atom's nucleus.
the number of neutrons in the atom's nucleus.
the number of protons and neutrons in the atom's nucleus