Elements With Valency 1 Are (a) Always Metals (B) Always Metalloids (C) Either Metals or Non-metals (D) Always Non-metals

Answer: (c) either metals or non-metals 

Elements with valency 1 can be either metals or non-metals due to the reasons stated below.

• Metals have 1 valency when there are 7 electrons present in their outermost shell. Hence, it is denoted by “+1” as they require one more electron to become more stable.
• Non-metals have 1 valency when there is only 1 electron present in their outermost shell. Hence, it is denoted by “-1” as they want to lose one electron to become more stable.