observe the given table answer the following question
element. A B C D E
atomic no 11 4 2 7 19
identify the two element that element that belongs to the same periodic give reason for your conclusion
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Answer:
A and E
Explanation:
Because A has atomic number 11 then electron situated in orbits like 2,8,1
E has atomic number 19 then electron situated in orbits like 2,8,8,1
both has 1 electron in last orbit
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