Which type of element has an electron configuration of 1s22s22p63s23p64s1? Question 1 options: alkali metal alkaline earth metal noble gas halogen

Alkali metals. K has this following electronic configuration 1s22s22p63s23p64s1.

Explanation:

The elements of group IA are known as alkali metals. They have following electronic configuration.

Li = 1s2 2s1 Na = [Ne]3s1 Rb = [Kr] 5s1 Cs = [Xe]6s1 Fr = [Rn] 7s1

Note:

As in this electronic configuration, the valence electron is one which only alkali metals have. Alkaline earth metals have 2 valence electrons. Halogens have 3 and nobel gases have complete valence shell i. e 8 electrons.