<u>Answer:</u> The oxidation number of magnesium in magnesium chloride is +2.
<u>Explanation:</u>
Oxidation number is defined as the number that is assigned to an element when it gains or looses electrons. If an element gains electron, it will attain a negative oxidation number and if an element looses electron, it will attain a positive oxidation number.
The chemical formula for magnesium chloride is
We take the oxidation state of magnesium atom be 'x'.
Oxidation state of chlorine atom = -1
Evaluating the oxidation number of magnesium atom:
Hence, the oxidation number of magnesium in the given compound is +2.
The average atomic mass of the imaginary element : 47.255 amu
<h3>Further explanation </h3>The elements in nature have several types of isotopes
Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
Mass atom X = mass isotope 1 . % + mass isotope 2.% ..
isotope E-47 47.011 amu, 87.34%
isotope E-48 48.008 amu, 6.895
isotope E-49 50.009 amu, 5.77%
The average atomic mass :