Question

Anomalous bohoniour of
period eleste​

Answer 1

Answer:

Explanation:

The reasons for differences in periodic properties and hence in chemical behaviour are:

•  Small size of these atom

• High electronegativity

• Large charge/radius ratio

• These elements also have only 4 valence orbitals available (2s and 2p)    for   bonding as compared to   the 9 available (3s, 3p, and 3d) to the other members of the respective groups, so their maximum covalency is 4. (This is why Boron can only form [BF4]– whereas Aluminium can form [AlF6]3-).

• It has been observed that Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, and Fluorine have slightly different periodic properties than the rest of the elements belonging to Group 1, 2, 13-17 respectively.

• For example, Lithium and Beryllium form covalent compounds, whereas the rest of the members of Groups 1 and 2 form ionic compounds.

• Also, the oxide that is formed by Beryllium when it reacts with Oxygen is amphoteric in nature, unlike other Group 2 elements that form basic oxides.  

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