Ca is the only element perhaps B
Ethenol. Which has a molor mass of 44.05 g/mol
Water is polar and dissolves polar substances
The correct statement is <span>(4) All atoms of a given element must have the same atomic number.
Atoms come in different isotopes(which have different mass), which differ in the number of neutrons, but are still the same element (this tells you why the other options are bad).
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