Question

B. The presence of______
and________
are necessary for iron to rust.

C.
________is used for making X-ray shields.
D.
__________non-metals is used in fluorescent bulbs to display advertisements
E.
________element is used for making pencil lead
F.
_______and___________
are lustrous non-metals.​

Answer 1

Answer:

B.water and oxygen

C. lead metal

D. neon

E. graphite

F. diamond and iodine

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Answer 2

Answer:

Explanation:

B. The presence of moisture and oxygen are necessary for iron to rust.

C. Lead is used for making X-ray shields.

D. Neon is the non-metals  used in fluorescent bulbs to display   advertisements .

E. Graphite element is used for making pencil lead .

F. Iodine  and Sulphur  are lustrous non-metals.​  

Elements                  

$\bigstar$ Elements are pure substances which cannot be chemically decomposed/broken down.

$\bigstar$ Elements are composed of identical atoms.

$\bigstar$ There are 128 known  elements.

Elements are Divided into three types , they are :-

• Metals

Example :- Platinum, Gold , Sodium  , Magnesium etc.

• Non - Metals

Example :- Nitrogen , Oxygen,Phosphorous etc.

• Metaloids/ Semi metals

Example:- Antimony, Bismuth , Germanium etc.