An Element has Ec:2,8,7
a) What is atomic number?
b) Name another element to which it has similar
properties?
c)It is bigger or smaller than another element with
atones no 16?
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Answer:
a. 17
b. bromine
●greenish yellow in colour
●melting pt -100.98℃
boiling pt -34.6℃
●a gas from halogen group.
c. smaller
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