Structure of At...

Study the following table.

What is ratio of time periods $$\left( { { T }_{ 1 } }/{ { T }_{ 2 } } \right) $$ in second orbit of hydrogen atom to third orbit of $${He}^{+}$$ ion?

$$0.25 g$$ of an element $$M$$ reacts with excess fluorine to produce $$0.547 g$$ of the hexafluoride $$MF_6$$. What is the element?

Which of the following pairs is correctly matched ? 

Which of the following sets of quanta numbers could represent the last electron added to complete the electronic configuration for a ground state atom of Br (Z = 35)? 

Arrangement of the following group of orbitals in which they fill with electrons :
(5f, 6p, 4p, 6s, 4d, 4f )

A compound has the molecular formula $$X_4O_6$$. If $$10$$ g of $$X_4O_6$$ has $$5.72$$ g X, then the atomic mass of X is :

According to the Bohr's atomic model, the relation between principal quantum number (n) and radius of orbit(r) is?

What does the electronic configuration $$1{ s }^{ 2 },2{ s }^{ 2 },2{ p }^{ 5 },3{ s }^{ 1 }$$ indicate?

The ratio of kinetic energy and the total energy of the electron in the nth quantum state of Bohr's atomic model of hydrogen atom is