Bohr's model of the atom states that electrons orbit an atom's nucleus in electron shells of increasing energy. The electrons are free of physical contact with the nucleus, but are held in orbit due to the electrons' attraction to the oppositely charged protons in the nucleus.
Thomson's model, or the plum pudding model, it describes atoms as spheres of positively charged matter, in which electrons are embedded in.
The key difference is the locations of, and the motions of the electrons.
Answer:
Iron is natural. Paper is man-made
Explanation:
Answer:
B. <em>Speed</em> is how fast an object is moving: speed = distance/time.
<em>Velocity</em> is the rate at which an object changes position: velocity = displacement/time
Explanation:
<em>Distance</em> is a <em>scalar </em>quantity. It has only <em>magnitude</em>. So, distance/time is also scalar. If you are travelling at 100 km/h, that is your speed, because you could be going in any direction.
Displacement is a <em>vector </em>quantity. It has both <em>magnitude and direction</em> So, displacement/time is also a vector. If you are travelling east at 100 km/h, that is your velocity, because you are stating both your speed and the direction
Uranium, most uranium does derive from a star. However, not from our sun.