Question: Diagonal relationships in the periodic table exist in addi-tion to the vertical relationships. For example, Be and Al are similar in some of their properties,

Diagonal relationships in the periodic table exist in addi-tion to the vertical relationships. For example, Be and Al are similar in some of their properties, as are B and Si. Rationalize why these diagonal relationships hold for properties such as size, ionization energy, and electron affinity.

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