Answer:
fluorine
Explanation:
The element fluorine has 9 protons and 9 electrons.
- Answer: <em><u>The compounds containing CFCs (chlorofluorocarbons) are mainly responsible for ozone layer depletion as these compounds react with ozone in the presence of ultraviolet rays to form oxygen molecule and thus, destroying ozone.</u></em>
Explanation: <em><u>Human activities cause the emission of halogen source gases that contain chlorine and bromine atoms. These emissions into the atmosphere ultimately lead to stratospheric ozone depletion. The source gases that contain only carbon, chlorine, and fluorine are called chlo- rofluorocarbons usually abbreviated as CFCs.</u></em>
Answer:
The main difference is their energy level, 2s orbital is higher than 1s orbital.
I can’t see the picture for some reason
Answer:
concave lens
Explanation:
it's concave lens because it diverges the ray/beam of light.
