Question

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

Answer 1

Answer:

• 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.