Complete each statement with the word that makes it true. The noble gases are the least
of any elements on the periodic table.

The
form acidic compounds with hydrogen.

The halogens are the most reactive among all the
.

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

conservation of mass

mass before something happens = mass afterwards