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 movement of aircraft through clouds can even cause lightning strikes. a single lightning event is a "flash", which is a complex, multi-stage explosively ejected.

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