Respuesta :

Ruthenium was discovered by K. Claus in 1844. It has an atomic number of 44. Two years earlier the element Terbium was discovered by G. Mosander. It has an atomic number of 65.

I hope I was able to answer your question. Have a good day. 

Answer:

The answer is silver.

Explanation:

The periods of the periodic table are the horizontal rows, and silver is one of them. edge 2022

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