Question

Which is the element with atomic no. 61? Write about it.

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Answer 1

1) It is the only lanthaniod which is radioactive .
2)It is only radioactive rare earth metal and it is one of only two radioactive element followed by stable elements on the periodic table. The other element like this is technetium
3)toxic in nature due to its radioactivity.
4)its isotopes generate X-rays through beta decay.

Answer 2

Answer:

The name of element is Promethium

Explanation:

its atomic number is 61 and the atomic mass is 145.

1. All of its isotope are radioactive.
2. it is extremely rare.
3. with only about 500 - 600 gram naturally occurring on earth's crust.