Plagiarism is when you copy someone else's work (usually word by word) and you do not acknowledge that you where not the person who wrote it, also, you do not cite where you received that info from. That is why we have copyright laws, where the author can choose whether to establish a penalty if copied.
Answer:
Os and atomic number 76.
Explanation:
It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores.
Only one?
If one then cheerful
If two then gloomy and cheerful
