Problem: The table below gives the number of protons (p) and neutrons (n) for four isotopes. (i) (ii) (iii) (iv) p 19 19 20 20 n 19 21 19 20 Write the symbol for the isotope (i).

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The table below gives the number of protons (p) and neutrons (n) for four isotopes.

(i) (ii) (iii) (iv)
p 19 19 20 20
n 19 21 19 20

Write the symbol for the isotope (i).

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