Question

What are the a) normal elements b) harmful elements ? Give two examples of each.​

Answer 1

Explanation:

answer is in attachment refer that

Answer 2

Answer:

hey mate

here is ur answer

Normal elements :

Normal elements includes both metals and non metals where as transition elements are only metals

Normal elements includes both metals and non metals where as transition elements are only metalsNormal elements have their only last shell incomplete wherese transition have last two shells incompletely filled.

Normal elements includes both metals and non metals where as transition elements are only metalsNormal elements have their only last shell incomplete wherese transition have last two shells incompletely filled.Normal elements are placed on the side of the periodic table whereas transition elements are at the middle of the periodic table.

harmful elements:

harmful elements (PHEs) can be defined as elements that are toxic at certain concentrations to one or more species, but in many cases are also essential nutrients at lower concentrations (e.g. Fe) (Bini and Wahsha, 2014) .

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