Asteroids do exert some gravitational pull.
Planetoid
electronegativity
Many things can happen if an asteroid hit the earth. Here is a list of a few consequences. There could be an explosion when the asteroid hits the earth. There could also be a tsunami if the asteroid landed in the water. Another possible consequence is a global firestorm. Another possible problem is Acid Rain. The last and final problem from this small list is temperature effects.
The energy of an asteroid can be determined by its kinetic energy, which is proportional to its mass and velocity squared. The potential energy of an asteroid in a gravitational field is influenced by its distance from a massive body. When an asteroid collides with a planet or another space object, the energy released can be significant and potentially catastrophic.
... another star.A planet.A cometAn asteroid
Not quite sure what you mean with hang from it; the asteroid would attract the building (much less so than Earth does, but still), so the asteroid would be "downward" for anybody close to the asteroid.In principle there is no reason why you couldn't build something on an asteroid, but that would not "hang... from the asteroid".
Planetoid is another name for an asteroid. See the related link for more information.
No.
Planetoid
There is no synonym for them.
Usually by another asteroid moving through the belt and hitting one, creating a force to move an asteroid from its orbit. Also, if a large enough asteroid passes by, it is possible that the gravity that it generates could pull a few off.
Another name for asteroids are planetoids.
It could perhaps be called an asteroid.
An asteroid can get out of the belt because of another huge asteroid hitting it or by getting pulled into an unstable orbit by the gravity of Jupiter. There are gaps called Kirkwood gaps in the asteroid belt at certain distances from the sun because the influence of Jupiter causes orbits at those distances to become unstable. A collision with a comet would be another possible reason, but this is very unlikely (except in Hollywood movies).
The first confirmed case of an asteroid orbiting another asteroid is the asteroid Ida which is orbited by a smaller asteroid orbiting it called Dactyl; other asteroid moons have been found since.
electronegativity
The word asteroid is a noun. It is a celestial body that orbits a star. Other words for asteroid are sphere, planetoid, heavenly body, and orb.