The atomic mass of an element whose atoms consist of seven protons, eight neutrons, and seven electrons is _____?
2 answers:
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In an arithmetic progression, consecutive terms differ by the same value.
So, we have
which reflects the fact that the difference between P and 6 must be the same than the one between P and 14.
The equation solves to
And in fact, if you start with
every pair of consecutive terms differ by 4.
