Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

Taking the example of an element of atomic number 16explain how the electronic configuration of the atom of an element relates to its position in the

modern periodic table and how valency of an element is calculated on the basis of its atomic number


Electronic Configuration - 2,8,6. The no. of shells occupied by the electrons indicates the period it belongs to. It occupies 3 shells, and hence it will be in the 3rd period. It will be in the 16th group as it has 6 valence electrons and lies in the 3rd period. ( We add 10 to the no. of electrons for elements in the 2nd and 3rd period when they have more than 1 or 2 electrons in the outermost shell to get the group no.) Atomic no. = no. of protons = no. of electrons. It has 6 electrons and hence it will have a tendency to gain 2 electrons to complete its octet as it is easier to do so and will require less energy than losing 6 electrons and hence will have valency 2. The atomic no. thus helps to determine the valency of an element by indicating the no. of valence electrons present. If the valence electrons are <4 it is likely to gain electrons while if valence electrons are >4 then it more likely to lose electrons.
0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts