Question

Question 18
Arrange the following elements in the order of their increasing nonmetallic character
Li, O, C, Be, F
(a) F < O < C < Be < Li
(b) Li < Be < C < O< F
(c) F < O < C < Be < Li
(d) F < O < Be < C < Li

Answer 1

Option (b) is correct.
Nonmetallic increases across a period as the number of valence electrons increases. Metals readily lose electrons and nonmetals readily gain electrons to attain the nearest noble gas electronic configuration.All the given elements belong to period 2. Fluorine with 7 valence electrons is the most nonmetallic and Lithium with 1 valence electron is the most metallic element.