The main reason that scientists would do a descriptive investigation is that . A. they don't like doing normal experiments B. they can't make observations about their topic C. they're trying to make a significant new scientific discovery D. they're studying something for which they can't do an experiment

6what is the importance of water on earth? a) it keeps the top layer of the geosphere cool b) it allows life to exist c) it provides ice at the poles d) it creates earth's blue color from space

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.