i] An element X has both K and L shells completely filled with electrons. The element has atomic number 10. Identify the element X. ii] In which group of the periodic table this element is placed? iii) Write its electronic configuration. What is its valency?.

i] An element X has both K and L shells completely filled with electro

1.	i] An element X has both K and L shells completely filled with electrons. The element has atomic number 10. Identify the element X. ii] In which group of the periodic table this element is placed? iii) Write its electronic configuration. What is its valency?.
Answer» Solution : i] the ELEMENT X is Neon (NE) ii] It is placed in the group 18 of the modern periodic table iii] ELECTRONIC CONFIGURATION of Neon is `{:(K,L),(2,8):}` Its valency is 0.