Chemistry, 09.09.2021 20:10 81074

These are the first 20 elements on the periodic table which of these elements had 20 protons in its nucleus (atomic number = 12)? 1. He

2. S

3. Mg

4. C

These are the first 20 elements on the periodic table which of these elements had 20 protons in its

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These are the first 20 elements on the periodic table which of these elements had 20 protons in its...