Protons, Electrons and many times Neutrons
Free flowing
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Booo
The particles start moving faster and the matter expands.
The most common change in an atom of the element calcium is the loss of the two electrons in the valence shell of atom,resulting ina calcium cation.
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No, sound cannot travel in a vacuum. Sound moves by vibrating particles of a solid, liquid, or a gas. Since there are no particles in a vacuum, sound cannot travel through it.
Helium has the weakest attraction for electrons in a bond with a hydrogen atom because it has only two electrons and a full valence shell, making it stable and less likely to attract additional electrons.
There are three feet in a yard !
I believe you are referring to rarefaction. The "trough" of a compression / rarefaction wave is called rarefaction.
they have sealed in oxygen so you can breathe and your blood doesn't explode Answer 2 The sealed-in oxygen doesn't stop your blood exploding, as you put it. The fact that the pressure within the spacecraft or space suit is more or less the same as on Earth is what stops that. There are other things in space as well, to be thought about. For example, there is radiation which is harmful (no atmosphere to cut it out) and there are subatomic particles which would bombard you if you were not contained ina protective shell.