Mendeleev left gaps for elements that were'nt discovered on that time then why did not he leave gap for helium, argon and neon ??

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Solution

Dear student,

There was no mention of noble gases like helium, neon and argon as they were not known at that time and were discovered much later.

Regards,

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Q. Gallium and germanium (discovered later) were placed below aluminium and silicon in their respective groups. The names given by Mendeleev for Gallium and Germanium are Eka-aluminium and Eka-silicon. Similarly, the gap that he has left for the undiscovered element that comes after aluminium is given the name Eka-aluminium.

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Mendeleev left gaps for elements that were'nt discovered on that time then why did not he leave gap for helium, argon and neon ??

Dear student, There was no mention of noble gases like helium, neon and argon as they were not known at that time and were discovered much later. Regards,

Dear student,

There was no mention of noble gases like helium, neon and argon as they were not known at that time and were discovered much later.

Regards,