Read the mathematical concept given below carefully and understand it. Then answer the following questions. Diagonal of a polygon is a line joining two non-adjacent vertices. See this table.

Complete the table given below and answer the following questions (symbol used are not true) Which element donates electrons in chemical reaction? .

Complete the table given below and answer the following questions (symbol used are not true) Which element in the table is the most stable one? Justify your answer. .

Complete the table given below and answer the following questions (Symbols are not real). Which element in the table is the most stable one? Justify your answer.

Complete the table given below and answer the following questions (symbol used are not true) Write the chemical formula of the compound formed by combining S with P. .

Read the following Passage. Understand the Mathematical concept in it and answer the questions that follow. Each question carries 1 score. The common difference of the arithmetic sequence 15,14,13,12,...... is 14-15=-1 . First terms of the sequence is 15 and the 15th term is 15+14x-1=15-14=1 . Similarly the 4th term is 12 and the 12^(th) term is 4. Its 16th term is, x_(16)=15+15x-1=15-15=0 . So the sum of the first 31 terms is also zero. that is if the n^(th) is m, then the mth term is n and the (m+n)^(th) term is zero. Seventh term of an arithmetic sequence is 10 and the 10^(th) term is 7. What is the common difference?