Question

The atomic number of the carbon nitrogen and oxygen are 6 7 and 8 respectively first what is the numbers of the valence ele

ctron in carbon and oxygen second name the element having smallest and largest atomic radius of any of the above three elements give reasons for your answer

Answer 1

Valence electron is the no. of electrons present in the last shell of an atom.
1)valence electrons in carbon is 4 since its electronic configuration is 2,4.
The valence electrons in oxygen is 6 since its electronic configuration is 2,6.

2)
+Oxygen lies in GROUP-16 AND PERIOD-2.
+Carbon lies in GROUP-14 AND PERIOD -2
+Nitrogen lies in GROUP-15 AND PERIOD - 2.

Therefore carbon has the largest and oxygen has the smallest atom because atomic size decreases as we go from left to right in a period. This happens due to increase in electrostatic force between nucleus and the valence shell due to increase in the no. of protons as we go from left to right in a period.
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Answer 2

Answer:

in oxygen there are 6 electrons

in nitrogen there are 5 electrons