# Question #a3f82

Aug 1, 2017

electropositivity

#### Explanation:

sodium , lithium and potassium are highly electropositive elements placed in ${1}^{s t}$ group in periodic table.
all these three have something in common . if you look at the electronic configuration of these elements (alkali metals) its identical.
here we got electronic configuration of all the three.
shell | K| L | M | N
Lithium (Li) | 2 | 1 |
Sodium (Na) | 2 | 8 | 1
potassium (K) | 2 | 8 | 8 | 1.

This data shows something identical in all that is presence of 1 ${e}^{-}$ in valence shell. these ${e}^{-}$ are present in s shell [refer aufbau principle].
This is the reason that they readily give ${e}^{-}$ from their valence shell since they got just 1 ${e}^{-}$ in valence shell which makes them a bit unstable in atom form. stability can be attained by forming ions .
so these have a greater tendency to form cations. and give up their ${e}^{-}$ easily.

every atom wants to attain a sense of nobility so it requires to either gain or lose electrons . losing 1 electron doesn't require much energy lose $\left({p}^{+} v s {e}^{-}\right)$. .