Answer:
Francium (Fr)
Explanation:
Looking at the periodic table, Francium has 7 energy levels as it is in the 7th Period and is in the 1st Group (meaning it has one electron in the outermost shell) which suggests that it has one valence electron.
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Answer:
all 4 of the middle ones are part of the nucleus
I think the answer is the last answer at the bottom
Answer:
neutral pH or neutral solution
Explanation:
when hydrogen ion concentration and hydroxide ion concentration the pH is neutral i.e. ph=pOH=7
Answer:
8 to 8.5 since that is the recommended and people usualy sleep more than that
