How many energy levels does period 5 and period 6 have?

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot? question 7 options: the heat from the hot water is conducted through the spoon handle the hot water heats the air surrounding the upper part of the spoon. the hot water causes a physical change in the spoon handle. the hot water causes a chemical reaction to take place in the spoon.

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?