6. oxygen has an atomic number of 8. what can you
conclude from this fact?
a. an atom of oxygen weighs 8 grams.
b. an atom of oxygen has 4 protons and 4 electrons.
c. an atom of oxygen has 8 positrons.
d. an atom of oxygen has 8 protons.

Acarpenter is driving a 15.0-g steel nail into a board. his 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. half of the kinetic energy of the hammer is transformed into heat in the nail and does not flow out of the nail. what is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? the specific heat of steel is 448 j/kg ∙ k. a) 2.7 k b) 1.8 k c) 7.7 k d) 8.1 k e) 3.6 k