A gaseous non-metal with configuration 2,6 & mass number 16.
Answers
Answered by
1
Answer:
A solid non metal belonging to the third period with atomic number of 15 is phosphorus with symbol P.
Explanation:
A metal of valency 1 is potassium with symbol K. Its atomic number is 19 and is an alkali metal.
A gaseous element with valency 2 is helium. Its symbol is He and atomic number is 2. It is an inert gas.
An element belonging to Group 2 (alkaline earth metals) is beryllium (Be). It has atomic number of 4.
A rare gas (or inert gas) is helium. Its symbol is He and atomic number is 2. Its valency is 2.
Similar questions