Semi-conductors can best be described as materials that (2 points)
are able to resist electron flow.
act as good conductors of electricity.
have negatively charged atoms.
have insulator and conductor properties.

Option (d) is the correct answer.

Explanation:

Substances whose conductivity lies between the conductivity of conductors and insulators are known as semi-conductors.

For example, silicon, germanium etc are good semi-conductors.

Whereas conductors are the substances which act as good conductors of electricity.

For example, metals are good conductors.

On the other hand, insulators are the conductors that resist the flow of electric current.

For example, non-metals are bad conductors of heat and electricity.

Thus, we can conclude that semi-conductors can best be described as materials that have insulator and conductor properties.

it is a solid

explanation:

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.