Because their atoms have the same number of electron in the highest occupied level.
Answer:
psychical change
Explanation:
chemical change is when substances combine and that’s not what’s happening
A mole of CO2 = 2 moles of O2
8 CO moles x 2 =
16 moles
The atomic number is the number of Protons on the nucleus of the atom, whereas the mass number of some isotope is the mass of the protons plus the mass of the neutrons. That's the difference between isotopes: number of neutrons.
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