Question

Aluminium is diagonally related to:
A. ${\text{Li}}$
B. \[{\text{Si}}\]
C. ${\text{Be}}$
D. ${\text{B}}$

Answer 1

Hint: There is a diagonal relationship between two atoms which are placed diagonally. This is usually found in the second and third periods of the periodic table. Left to right and top to bottom of the periodic table has almost an opposite effect in the properties of elements.

Complete step by step solution:
The periodic table is the arrangement of elements in the order of atomic number, electronic configuration and their properties. The elements show a similarity in some properties, which is known as periodic trends. These are shown concerning their groups and periods. Down the group, atomic radii increases, i.e. the size of the atom increases. Top to bottom, the atomic size increases. According to the periodic table, generally, metals are placed on the left, and non-metals are placed on the right.
There is a diagonal relationship between two atoms which are placed diagonally. It is usually found in the second and third periods of the periodic table. From left to right, elements are more electronegative, covalent. Down the group, atomic size increases and becomes more basic. Earlier it was found that the properties of second-period elements are almost similar to that of third-period elements. These elements were diagonally placed.
A. Lithium has similar properties with magnesium
B. Silicon shows a similarity with boron.
C. Beryllium has a similarity with aluminium.

Additional information:
${\text{L}}{{\text{i}}^ + }$and ${\text{M}}{{\text{g}}^{2 + }}$form normal oxides. The charge density of both is almost the same. Their nitrides are of the same formula. Covalent organometallic compounds are formed with both of these elements. Diagonal relationship between silicon and boron is not very significant.

Note: ${\text{Be}}$and ${\text{Al}}$have the following similarities:
Form covalent bonds
Their chlorides act as Lewis acids.
Same electronegativity and polarizing power.
Both have oxide films on their surface.