What’s Promethium’s atomic number?

61

It’s Symbol?

(Pm)

When was Promethium discovered?

1945

Who discovered Promethium?

Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. Coryell

Where Its name came from?

Was named from the god prometheus (who stole fire of the sky and gave it to man)

It’s atomic mass?

145

It’s melting point?

1100 `C

It’s boiling point?

3000 `C

It’s electron configuration?

[Xe] 6s2 4f5
2, 8, 18, 23, 8, 2

How many neutrons are there?

84 neutrons

How many protons and electrons are there?

61

Is Promethium’s isotopes stable or not?

No there is no occurring isotopes

What is Promethium’s color?

Silvery-White

What is it’s group name?

Lanthanide

What is it used for?

Promethium is used in atomic batteries for spacecraft and guided missiles. Such batteries are used in watches, radios and guided-missile instruments.