Which of the following statements is true?

1. dalton believed atoms were made mostly of empty space.
2. plasmas have a net negative charge.
3. the number of protons in an element is always equal to the number of neutrons.
4. solids have a fixed mass, volume, and shape.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size