Pitch-Blende is the source of some metals. Find the total No. of such metals among these:

[ $H g, R a, U, T h, Z n, T c$ ]

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Solution

Pitchblende is also called uraninite. It is a mineral of uranium containing UO2 and UO3.
It is our primary source of uranium. The mineral is black in color, like 'pitch'.
The term 'blende' came from the German miners who believed it contained many different metals all blended together.
Pitchblende contains many other radioactive elements that can be traced back to the decay of uranium,
such as radium, lead, thorium, helium and several actinide elements.
Thus, the total number of metals present in pitchblend is 3.
They include U, Ra, Th.

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