This sounds very much like a chicken-egg problem.
The first thing that formed must be hydrogen nuclei. The only other alternative is that the atom was created instantly, and the nuclei sprang forth at the same time as the atom, meaning that neither was technically first. The logic is that an atom can’t form without a nucleus, but it theoretically could be created instantly.
The best and most correct answer among the choices provided by your question is the first choice or letter A.
A ph of 7 contains only water.
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The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized
