Question

The electrons in the atoms of four elements a b c d are distributed in three cells having 1357 electrons in the outermost shell state the period in which these elements can be placed in modern periodic table

Answer 1

The electrons in the atoms of four elements a b c d are distributed in three cells having 1357 electrons in the outermost shell state the period in which these elements can be placed in modern periodic table.

Answer 2

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The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table.