Answer:
Iron, copper , calcium
Explanation:
Iron , copper and calcium are present in three different groups.
Iron is present in group eight.
Copper is present in group eleven.
Calcium is present in group two.
Sodium , potassium and rubidium are present in same group i.e. group one. These are alkali metals.
Fluorine, chlorine and bromine are present in group seventeen. These are halogens.
Argon, Krypton and xenon are present in same group i.e, group eighteen. All are these noble gases.
Answer:
Sound waves are travelling vibrations of particles in media such as air, water or metal. So it stands to reason that they cannot travel through empty space, where there are no atoms or molecules to vibrate.
Explanation:
well, without the article, I'm guessing the main idea is about the Great Wall of China
The answer of the question is 9075
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