In an atom, the first shell may contain upto 2 electrons, the second shell upto 8, the third upto 18 and then fourth shell upto 32 electrons. Explain this arrangement in terms of quantum number.

twice as many electrons in its second shell as in its first shell?

An atom has a electrons in the first (K) shell, 8 electrons in the second (L) shell and 2 electrons in the third (M) shell . Give its electronic configuration and find out the following: (a) Atomic number (b) Total number of principal quantum numbers (c) Total number of sublevels (d) Total number of s-orbitals (e ) Total number of p-electrons.

In the helium atom, the number of electrons in the L shell is

All electrons on the 4p sub-shell must be characterized by the quantum number

What is the general name of the elements having 8 electrons in the valence shell of their atoms ?

An element has 2 electrons in the M shell. What is the atomic number of the element ?

An atom has 2 electrons in K shell, 8 electrons in L shell and 6 electrons in M shell. The number of s-electrons present in that element is