This element is beryllium.
If you find my answer helpful, please brainliest me!
The answer is ClO2 according to google tbh
For example, the atomic mass of an oxygen atom is 16.00 amu; that means the molar mass of an oxygen atom is 16.00 g/mol. Further, if you have 16.00 grams of oxygen atoms, you know from the definition of a mole that your sample contains 6.022 x 10^23 oxygen atoms.
Do you have the picture of the data?
