The diagram shows the electron configuration of an atom of an element for the electrons in the s and p orbitals. A shaded circle is shown. There are two concentric circles around this shaded circle. In inner concentric circle has two dark shaded dots. The outer concentric circle has two dark shaded dots in the corresponding position to the inner concentric circle. The outer concentric circle also has four light shaded dots, two on the left and two on the right boundary.

What is the group number of the element in the periodic table?

1
2
16
17

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metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

a electronegativity decreases beacuse the size of nucleus is bigger.