! 1. the isotope sodium-20 has how many protons? 11 na 22.99 sodium a) 9 b) 10 c) 11 d) 12 2. the isotope sodium-20 has how many neutrons? 11 na 22.99 sodium a) 9 b) 10 c) 11 d) 12

The isotope sodium-20 has 11 protons

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 .

4- c, because all matter stays the same no matter what. it is still there. 5- b, because matter is known as mass. 6-c because, flammability is a chemical property. malleability is changing the shape of an object.