Please help, i have my test today (a) A carbon atom contains 6 electrons, 7 neutrons and 6 protons.
(i) State the mass number of this carbon atom

carbon atoms with the usual 6 neutrons have a mass number of 12 (6 protons + 6 neutrons = 12), so they are called carbon-12. Carbon atoms with 7 neutrons have an atomic mass of 13 (6 protons + 7 neutrons = 13). These atoms are the isotope called carbon-13.

an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.

the movie was based there, and all the animals and characters are native.

~courtney

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.