Structure of At...

What is the name and symbol of the element with atomic number 112?

If the radius of first Bohr orbit is x pm, then the radius of the third orbit would be :

The radius of a hydrogen atom in the ground state is $$0.53 \mathring {A}$$. What will be the radius of $$Li^{2+}$$ in the ground state?

Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?

The statement that is not correct for periodic classification of elements is :

Which of the following transitions will involve maximum amount of energy?

The radius of the stationary state which is also called Bohr radius is given by the expression $$r_n= n^2a_0$$ where the value of $$a_0$$ is:

Which of the sequences given below shows the correct increasing order of energy?

The electron in Bohr's model of hydrogen atom is pictured as revolving around the nucleus in order for it to :

The atoms in a molecule do not remain stationary. They vibrate around their mean position, by stretching or bending out of plane. We gain useful knowledge about these vibrations and the energy they carry by studying: