Structure of At...

The total number of neutrons in all isotopes of hydrogen is equal to:

Determine the element if its ground state has 13 electrons in its "M-shell".

The atomic numbers of elements X,Y and Z are 19, 21  and 25 respectively. The order of number of electrons present in the M shells of these elements ______________.

A sample of rock from moon contains equal number of atoms of uranium and lead $$(\mathrm{t}_{\frac{1}{2}}$$ for $$\mathrm{U}=4.5\times 10^{9}$$ years $$)$$. The age of the rock would be

The main defect of Bohr's atom model is :

The maximum number of electrons that can be filled into all the orbitals corresponding to the azimuthal quantum number $$l$$ = 3, is:

After the completion of $$np^{6}$$ electronic configuration, the next orbital will be filled by:

For an element (Z=25), how many electrons are present in the "N" shell in its ground state?

The number of electrons in an element $$X$$ is 15 and the number of neutrons is 16. The element can be represented as :

Identify the correct statements.
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons