Answer:
Probably D, Electron Cloud.
The mass number of boron is 11
Answer:
![\boxed{\mathrm{view \: explanation}}](https://tex.z-dn.net/?f=%5Cboxed%7B%5Cmathrm%7Bview%20%5C%3A%20explanation%7D%7D)
Explanation:
1. Particles are very far apart. <u>(Gas)</u>
2. Particles are moving quickly. (<u>Liquid</u>, <u>Gas)</u>
3. Particles can flow past each other. (<u>Liquid</u>)
4. Particles are very close together. (<u>Solid</u>)
Gas particles are very far apart from each other and move quickly. Liquid particles can flow past each other and can move quickly. Solid particles are tightly packed together.
I believe the answer is two
Isotopes have same atomic number or same number of protons, but different number of neutrons and mass number.
If they have same atomic number or same number of protons as the original one they are isotopes.