Question

You are given four elements with some description of each element place them in the modern periodic table . (state which period and group they belong)
(a ) essential for breathing and burning.
(b) inactive to electrons in the outermost shell.
(c) atoms has same number of electron proton and neutron and is used in Fertilizer industry .
(D) this element forms the hardest naturally occurring substance has allotropes.​

Answer 1

Explanation:

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