Name the chemical element, the atomic nucleus of which contains: a) 14 protons and 14 neutrons;

Name the chemical element, the atomic nucleus of which contains:
a) 14 protons and 14 neutrons;
b) 19 protons and 20 neutrons;
c) 34 protons and 45 neutrons;
d) 92 protons and 146 neutrons.

a) silicon;
b) potassium;
c) selenium;
d) uranium.

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