The Z number is the atomic number. The atomic number is number of protons in the atom that defines what element it is. In this case there are 9 protons, making that the atomic number/Z number.
Answer from: Quest
fgravity=10x10=100n case 1
fgravity=30x20=600n case 2
6 times more
Answer from: Quest
hypothesising or postulating
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