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jeka94
3 years ago
7

. Element X has a nucleon (mass) number of 19 and a proton (atomic) number of 9.

Chemistry
1 answer:
Marina86 [1]3 years ago
7 0

Answer:

C

Explanation:

it belong to that group as it needs 1 electron to be chemically stable

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Which one of the following groups of chemical compounds is composed entirely of organic compounds?
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Answer:

D

Explanation:

Organic compounds are chemical compounds which usually contains one or more atoms of carbon, hydrogen, oxygen and sometimes nitrogen or sulphur. Carbon and hydrogen are the main element that is contained in most organic compounds.

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