The ________ orbital is degenerate with 5py in a many-electron atom.
<h2>
5px is the correct answer</h2>
<u>Answer:</u> The element represented by M is Strontium.
<u>Explanation:</u>
Let us consider the molar mass of metal be 'x'.
The molar mass of MO will be = Molar mass of oxygen + Molar mass of metal = (16 + x)g/mol
It is given in the question that 15.44% of oxygen is present in metal oxide. So, the equation becomes:

The metal atom having molar mass as 87.62/mol is Strontium.
Hence, the element represented by M is Strontium.
C. Answer correct I think…
Substances that cannot be separated and found on a periodic table are elements.