Osmium atomic number is 76
<h3>Answer:</h3>
Oxidation number refers to a number given to an atom which shows the number of number of electrons lost (or gained, if the number is negative), by an atom of that element in the compound.
Hence oxidation number of following atoms in given reaction are:
In NaOH:
Na = +1
O = -2
H = +1
In H2:
H = 0
The best example of a heterogenous mixture is sand at the beach. This is a good example as the sand and water do not chemically come together to create a new mixture and the composition of both elements stay constant
