The question is incorrect, the correct question is:
1s2 2s2 2p6 3s2 3p3
Atoms of an element, X, have the electronic configuration shown above. The compound most likely formed
with magnesium, Mg, is
a. MgX
b. Mg2X
c. MgX2
d. Mg2X3
e. Mg3X2
Answer:
e. Mg3X2
Explanation:
Let us reexamine the electronic configuration of atom X; 1s2 2s2 2p6 3s2 3p3 .
This implies that it is a member of group 15 whose outer electronic configuration is ns2 np3. Members of group 15 have a valency of 3.
Therefore, during exchange of valence, the subscript of X becomes 2 (valency of magnesium) and the subscript of Mg becomes 3(valency of X).
Hence the formula is Mg3X2 as shown in the answer.
The branch of science which deals with chemicals and bonds is called chemistry.
The correct option is D.
The representation of electrons in their shell is called electronic configuration. To find the element we have to count the electrons in it.
The total number of electrons is 2+2+6+2+6 = 18 which is argon a noble gas element.
The valency of the magnesium is 3, Hence the compound they will make is[tex]MgAr_3[/tex].
Hence the correct option is D that is MgX3.
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