Structure of At...

The electronic configuration of an atom/ion can be defined by which of the following?

Which among the following is incorrect of $$_{5}{B}$$ in normal state?  

After filling the $$4d$$-orbitals, an electron will enter in:

The orbital diagram which violates the 'aufbau principle' is:

The mass of an atom of carbon is:

For $${Li}^{2+}$$, when an electron falls from a higher orbit to $$n$$th orbit, all the three types of lines, i.e., Lyman, Balmer and Paschen was found in the spectrum. Here, the value of '$$n$$' will be ___.

26.8 gm of $$Na_2SO_4\ . nH_2O$$ contains 12.6 gm of water. The value of 'n' is:

After $$np$$-orbitals are filled, the next orbital filled will be:

The molar mass of $$N_2O$$ as well as $$CO_2$$ is $$44\, g\, mol^{-1}$$. At $$25^o C$$ and 1 atm pressure, 1 L $$N_2O$$ contains n molecules of gas. The number of $$CO_2$$ molecules in 2 L under same conditions will be:

A quantity of aluminium has a mass of $$54 g$$. What is the mass of same number of magnesium atoms?