vickypandola1023
contestada

24.1% of all the isotopes of an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. How many protons
does this element have? (hint: Find the average atomic mass)
3
34
33
no way to know

Respuesta :

pstnonsonjoku

The number of protons in the element is 33.

From the information provided we can find the relative atomic mass of the element as follows;

RAM = (0.241 × 75.23) + (0.487  × 74.61) + (0.272 × 75.20)

RAM = 18.13 + 36.34 + 20.45

RAM = 74.92  amu

The element with relative atomic mass of 74.92 amu is Arsenic.

The atomic  number of arsenic is 33. This is the number of protons in its nucleus. Therefore, the number of protons in the element is 33.

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