The radioactive element used in heart pacemakers is

The radioactive element used in heart pacemakers is 

(1) Uranium 

(2) Deuterium 

(3) Plutonium 

(4) Radium 


Answer: (1) The actinides (or actinoids) are chemical elements with atomic numbers between 90 and 109 inclusively. They occur between Groups 3 and 4 in Period 7 of the periodic table. All elements in this family are radioactive. Five actinides, namely: thorium, protoactinium, uranium, neptunium, and plutonium, have been found in nature. Plutonium is used in the manufacture of nuclear weapons and as the power source in nuclear power plants. On a smaller scale, it is also used as a power source in smaller devices such as the heart pacemaker. 

The radioactive element used in heart pacemakers is   (1) Uranium   (2) Deuterium   (3) Plutonium   (4) Radium


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