Chemistry JAMB

Beryllium and aluminium have similar properties because they _______?

A. are both metals
B. belongs to the same group
C. belong to the same period
D. are positioned diagonally to each other

Correct Answer:

Option D – are positioned diagonally to each other

Explanation

At the beginning of periods 2 and 3 of the Periodic Table, there are several cases where an element at the top of one group has some similarities with an element in the next group.

For example, boron is a non-metal with some properties rather like silicon. Unlike the rest of Group 2, beryllium has some properties resembling aluminium. And lithium has some properties which differ from the other elements in Group 1, and in some ways resembles magnesium.

There is said to be a diagonal relationship between these elements. There are several reasons for this, but each depends on the way atomic properties like electronegativity vary around the Periodic Table.

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