Please help me

From what i understand the correct option would be A. Clouds

Explanation:

What is a particle consisting of a nucleus surrounded by a cloud of electrons?

The region where an electron is most likely to be is called an orbital. Each orbital can have at most two electrons. Some orbitals, called S orbitals, are shaped like spheres, with the nucleus in the center.

What particle travels around the nucleus?

Protons and neutrons are tightly packed in a small solid sphere called the nucleus of the atom. Around this nucleus is a cloud of electrons. Electrons move about in random motion at different levels around the nucleus depending on their energy.

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is