What is the mass number of the ion consists of 12 electrons, 14 protons, and 15 neutrons? [P+ n] e. 21
g. 23
f. 29
h. 33

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According to the big bang theory, after the "bang," the universe remained dark until about  300,000 yearsone billion yearsthree minutesthree billion years  later, when neutral atoms began to form.

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