The number of protons determines the atomic number atomic mass atomic structure atomic charge

The correct answer is:

atomic number

Explanation:

The atomic number or proton number (symbol Z) of a biochemical element is the number of protons observed in the nucleus of an atom. It is equal to the charge number of the nucleus. The atomic number uniquely recognizes a chemical element. In an uncharged atom, the atomic number is also similar to the number of electrons.

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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i think that d. wind is the answer.   i missed the question when i answered a. currents.