An element's atomic number is the
a. number of protons in an atom's nucleus.
b. weight of the atom.
c. mass of the atom.
d. sum of the protons and neutrons in an atom.

What provides structure to the human body?

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.