Classification ...

Electronic configuration of $$Si$$ in ground state is _____________.

Which of the following sets does not belong to the same group?

What are the electronic configuration of $$Na^{+}$$ and $$Cl^{-}$$ ions?

Which element of 2nd period forms most acidic oxide?

The electronic configuration of a dipositive metal ion $$M^{2+}$$ is $$2, 8, 14$$ and its ionic weight is $$56$$. The number of neutrons in its nucleus would be:

Who was the first to classify the elements into metals and non-metals?

Which is the correct electronic configuration of $$Cr$$(Chromium)?

Which of the following is correct for electron affinity?

The correct order of electron affinities of $$S,\ N,\ O$$ and $$Cl$$ is:

Number of electrons in $$M$$ shell of an element with atomic number $$28$$ is _______.