Explain what is wrong with the following electron configurations. Then annotate the configuration to correct the error . a) 1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p6
b) 1s2 2s2 2p6 3s3 3d5

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

A.(nh4)(2co3)is the correct answer