CBSE Class 10 Science 2019 · Paper 31/5/3 · Question 20
Answer the following questions based on the elements with atomic number 3 to 9 :
- (a)Name the element with smallest atomic radius.
- (b)Name the element which shows maximum valency.
- (c)Name the element which is a metalloid.
- (d)Name the element which is most electropositive.
- (e)Write the chemical formula of the compound formed when the elements of atomic number 6 and 8 react together.
Answer
Fluorine has the smallest radius, carbon the maximum valency, boron is the metalloid, lithium is most electropositive, and carbon with oxygen forms .
(a) Fluorine (F)
(b) Carbon (C), with valency
(c) Boron (B)
(d) Lithium (Li)
(e) (carbon dioxide); in a limited supply of oxygen, carbon forms (carbon monoxide).
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