The electronic configuration of the atom says that the total number of electrons here is 16, where 6 electrons in the two outer shells 3s and3p are valence electrons. Hence, there are 6 valence electrons.
Valence electrons are electrons located in the outermost shell or orbital of an atom. These electrons are loosely bound and screened from the nucleus, so that they participate in chemical bonding.
The electrons filled in the inner shells are called inner electrons or core electrons. They are tightly bound with the nucleus. Electrons are filled in the orbitals from that of lower energy levels to the higher energy levels.
The outermost shell in the given electronic configuration is 3s and 3p. Thus the number of valence electrons is 6.
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