What is the best definition
of the atomic number?
A. The number of protons found in the
nucleus.
B. The number of protons found
outside the nucleus.
C. The number of neutrons found in
the nucleus.

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?