Question

15 Who am I? (Each clue represents a single Element)
a) I am essential to human beings for their healthy teeth and bones
b) I am 78% in the air. I am
esponsible for growth of plants.
c)Iam used to kill bateria in drinking water
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Answer 1

Answer:

a.calcium

b.nitrogen

c.flourine.

Answer 2

Answer:

a calcium

b nitrogen

c chlorine