Answer:
14
Explanation:
There are 4 quantum numbers:
<em>n</em>: principal quantum number - describes the electron shell(varies from 1 to 7);
<em>l</em>: azimuthal quantum number - describes the subshell (varies from 0 to 3);
<em>m</em>: magnetic quantum number - describes the specific orbital (varies from -l to +l passing by 0);
<em>s</em>: spin quantum number - describes the spin of the electron (-1/2 or +1/2).
In each orbital (described by m) the maximum number of electrons is 2, so, for subshell 3, the magnetic numbers are -3,-2,-1,0,+1,+2, and +3. So there are 7 orbitals. The maximum number of electrons that can have n=5 and l= 3 is 14.
I think it might be Core Electrons and Valence Electrons respectively. As core electrons are the name of the electrons for the inner levels. While valence is the outer shell electrons.
There are 18groups in modern periodic table.
- The modern periodic table is discovered by famous scientist Henry Mosley in 1914.
- The modern periodic table is also called long term periodic table.
- It has 7periods and 18groups.