How do you write the ion notation for an atom with 20 protons and 18 electrons?

Answer 1

#Ca^(2+)#

If it has got 20 protons, 20 positively charged, massive nuclear particles, the element is calcium by defintion, i.e. #Z#, the atomic number #=# #20#.

The neutral metal has 20 electrons; the metal can ionize to form caclium ion, #Ca^(2+)#.

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Answer 2

Owen Ambrose

The ion notation for an atom with 20 protons and 18 electrons is ( \text{Ca}^{2+} ).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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