Newlands stated that there was a periodic similarity in properties of every eighth element in his system. However, today we see that for periods 2 and 3. the similarity occurs in every ninth element. What is the reason? Explain.

Due to incomplete periodic table the Newlands theory of octaves was rejected.

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Explanation:

Newlands published his periodic table in 1864. He was a British analytical chemist.

His table was quite incomplete. He based the table on the so called "law of octaves" which states that the properties of elements are similar after each eight element.

This was possible because the noble gases were not yet discovered. After the discovery of the noble gases, similar properties of elements can only occur after every ninth element.

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.