Structure of At...

Find number of protons and neutrons for (a),(b) and (c) respectively.

Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order.
(i) Rutherfords atomic model
(ii) Thomsons atomic model
(iii) Bohr's atomic model

How many lines does a spectrum contain in an electronic transition from $$n =1 \:to \:n = 5$$ in hydrogen atom?

The ratio of the radii of hydrogen atom and its nucleus is$$~ 10^5.$$ Assuming the atom and the nucleus to be spherical, if atom is represented by planet earth $$R_e = 6.4 \times10^6 m$$, estimate the size of the nucleus(radius).

The electronic configuration of element with atomic no. $$14$$ is:

Calculate the mass number of atoms $$X, Y$$ and $$Z$$?

In which of the following, Aufbau principle is violated?

The number of electrons, protons and neutrons in an atom whose atomic number is 11 and mass number 23 will be:

In an atom, the differentiating electron enters into 7s sub shell. The number of incomplete shells in the atom could be:

For manganese atom, assuming that Hund's rule is not valid for $$l=2\:sub shell,$$ predict the unpaired electrons and electron pairs in that sub shell of atom.