The atomic mass of an element is
a. a weighted average of the masses of an element’s isotopes.
b. twice the number of protons in one atom of the element.
c. the sum of the protons and neutrons in one atom of the element.
d. a ratio based on the mass of a carbon-12 atom.

explain

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m

If a balloon is taken outside on a very cold day, what will occur?

What are the starting materials for nuclear fission? two small nuclei two large nuclei a neutron and a large nucleus a neutron and a small nucleus