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Q.

An isotope has atomic number 19 and mass number 39?

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Asked by radha sharma, 02 Feb '13 01:08 pm
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Answers (6)

 
1.

It is potassium
Answered by Quest, 02 Feb '13 01:40 pm

 
  
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2.

Potassium (Kalium)
Answered by Sagnik Biswas, 09 Feb 05:38 pm

 
  
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3.

Potassium(K) has at.no.19 and mass no. 39.
Answered by amitava duttamajumdar, 03 Feb '13 03:20 pm

 
  
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4.

If you asking what it is, it is potassium
Answered by anil garg, 02 Feb '13 04:04 pm

 
  
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5.

It is potassium.
Answered by iqbal seth, 02 Feb '13 01:17 pm

 
  
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6.

Okay, simply put, isotopes are an element with less or more neutrons. For example, generally carbon has six protons neutrons and electrons. So this is called Carbon-TWELVE because it has SIX protons and SIX neutrons which add up to TWELVE. The number represented is the atomic mass. So a carbon atom with SIX protons and SEVEN neutrons is Carbon-THIRTEEN. Now for the number you said, the isotope has a mass number of THIRTY NINE so the element is X-THIRTY NINE. The number of protons NINETTEN (same as the atomic number) is subtracted from THIRTY NINE which results in TWENTY. Because the protons and neutrons make up the mass THIRTY NINE that means there is NINETTEN protons and TWENTY neutrons. Because isotopes have a neutral charge that means the positive (protons) needs to equal the negative (electrons), thus it has NINETTEN electrons as well.
Answered by Ataur Rahman, 02 Feb '13 01:13 pm

 
  
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