I have 8 valence electrons, completely nonreactive, and my family contains Helium that is used to fill balloons! I must be a... a
metal
b
nonmetal
c
metalloid
d
noble gas

Noble gas

Explanation:

Noble gases are complete octets ( have 8 valence electrons) Helium is a member of this family.

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.