Question
Phenolphthalein is colorless up to a pH of ____ and after that it becomes purple.
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In element notation, A is the ____
In element notation, Z is the ____
____ is the weighted average of the masses of an element's isotopes .
Atomic weight is ____.
The ____ states that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus.
The Rutherford Model states that ____.