When determining the formula for a compound, it is important to know the valence numbers of each element. suppose you want to write a formula for a compound with these two elements: element a = valence 3 element b = valence 2 in the formula, what number will be the subscript for element b?

Air can be considered a mixture. which statement does not explain why?

Juju.01) 5 geologic events a group of students designed an experiment in an ice rink to represent the solar system. the steps of the experiment are listed below. 5: geologic events 1. choose a student to represent the sun. the planets are represented by two tennis balls. 2. ask the student to hold the tennis balls in each palm and spin on the ice with arms stretched out. 3. ask the student to draw in the arms after about 10 spins. 4. observe the student's arms rotate faster when they are closer to the body. 05 geologic events enors) the experiment most likely demonstrates that (2 points) 07 discussion-based sessment/module planets exert gravitational force on the sun the sun exerts gravitational force on the planets 3.07 discussion-based ssessment speed of a planet depends on its distance from the sun new version available! (3.0.119) get it now submit 18.07: module exam description

What are fossils of organisms that existed over a wide area but only for a limited time period called?