Question

how to identify elements as metals non metal and Noble gas?
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Answer 1

Answer:

Reactivity with oxygen

Explanation:

Let the given element be x

X oxide when reacted with acid if produces salt and water then that element is metal because metal oxides are base.

X oxide when reacted with base if produces salt and water then it is a non-metal because non metal oxide are acidic in nature

Answer 2

Answer:

metals are sonorous,hard,malleable,ductile high strength and pass electricity easily

and it is also a good conductor of heat and electricity

non-metal is not applicable to conduct electricity expect graphite which pass electricity and non-metals are not hard,not sonorous,and non metals are easy to break

expect diamond is a hard non metal

noble gas ar called inert gas that is group of gases that are not react with any chemical reaction

hope this answer help u