A. Large atoms have valence electrons farther from the nucleus and lose them more readily, so they are more reactive than small atoms.
For example, the valence electron of a small atom like Li is tightly held. <em>Lithium gently fizzes</em> on the surface as it reacts with the water to produce hydrogen.
In contrast, the valence electron of a large atom like Cs is so loosely held that <em>cesium exlodes </em>on contact with water.
Answer:
During chemical reactions, matter is neither
created nor destroyed; it just changes form.
Explanation:
a) the kinetic energy decreases as in a gas, the particles are widespread and move freely but in a liquid, their movement is more limited
