Find the noble gas that only has two valance electrons

Asa choose the correct set of reaction coefficients to properly balance the following chemical equation according to the law of conservation of mass: __s8 + __o2 ==> __so2 1, 1, 8 1, 8, 1 1, 8, 8 8, 1, 1

Light waves can move through , but they travel fastest when they move through a(n) .

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate