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If a radioactive element half life is 500000 years given 20 grams of the element how much is left after 4 half lives?
Wiki User
∙ 14y ago
Just divide the original amount by 2, 4 times: 10; 5; 2.5; 1.25. The final number is the answer.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoA polonium isotope with the half life of 50 years don't exist.
For any isotope of any element after a half life the number of remaining atoms is 50 %.
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A radioactive element has a half-life of 3000 years. If a sample of this element begins with a mass of 60 grams how long would you have to wait for the mass to decrease to 15 grams?
You would have to wait 6,000 years for this to occur, because it requires twice the half-life to reduce the radioactive isotope to 1/4 of its original mass.
Would 500000 micrograms be equal to 0.5 grams?
Yes, that is true. This is because there are 1,000,000 micrograms in a gram. So 0.5 grams is 500,000 micrograms.
Is relative humidity given in percent or grams?
Grams
Does mole of carbon atoms have a different mass than a mole of sulphur atoms?
Yes. To find out the mass of a mole of atoms of any given element, see the atomic mass given on the periodic table. A mole of carbon atoms has a mass of 12.011 grams. A mole of sulfur atoms has a mass of 32.06 grams.
Which has more atom 70g of mg or 10g of ag?
Inder to find this out, you divide the numbers of grams you have by the amount of grams it takes to make one mole of that element (6.022 x 10^23) and then multiply by Avigadros number (6.022 x 10^23). That should tell you how many atoms are in the amount of grams you have. See, Avigadros number is the amount of atoms in one mole of every element, so you can use that to figure out about how many atoms are in any given element.
How many grams are in 500000 kilograms?
500000000 grams
How many grams are in 500000 kg?
1,000,000
A radioactive element has a half-life of 3000 years. If a sample of this element begins with a mass of 60 grams how long would you have to wait for the mass to decrease to 15 grams?
You would have to wait 6,000 years for this to occur, because it requires twice the half-life to reduce the radioactive isotope to 1/4 of its original mass.
What does 500 grams equals?
500000 mgs 0.5kg
What is the rarest element on earth?
In the earth Astatine is rarest naturally occurring element, less than 30 grams for entire crust.
How do you find the moles of a given element?
One takes the atomic mass of that element (the number under the element on a periodic table, measured in amu). That number is the number of grams of the element it takes to make one mole. in other words:X grams (of element)(Atomic Mass of element)= --------------1 mol (of element)
A radioactive element has a half-life of 2000 years. If a sample of this element begins with a mass of 100 grams how long would you have to wait for the mass to decrease to 25 grams?
You would have to wait 6,000 years for this to occur, because it requires twice the half-life to reduce the radioactive isotope to 1/4 of its original mass.
How many grams make 5.00kg?
No difference at all. the second figure is simply displaying one decimal place.
How many grams are there in 500 kilograms?
There are 1000 grams in one kilogram. Therefore, 500 kilograms is equal to 500 x 1000 = 500000 grams.
A 100 gram sample of a radioactive element is present at 9 a.m. on Monday and only 25 grams of the element can be detected at 9 a.m. on Friday. What is the half-life of the source?
The half-life is 2 days. You start with 100 grams. In one half life, you will lose 50 grams and have 50 grams remaining. In a second half-life, you will lose 25 of the 50 grams and have 25 grams left. You will have lost 75 grams of a 100 gram sample of radioactive material and have only 25 grams of it left after two half-lives. That means there are two half-lives from 9 a.m. Monday to 9 a.m. Friday. That's 4 days for 2 half-lives, or 2 days for one half-life.
Would 500000 micrograms be equal to 0.5 grams?
Yes, that is true. This is because there are 1,000,000 micrograms in a gram. So 0.5 grams is 500,000 micrograms.
According to Dalton if 2 grams of element X combine with 4 grams of element Y to form compound XY how many grams of element X would combine with 28 grams of element Y to form the same compound?
This is just simple maths. If you need 2 grams of X for every 4 grams of Y, you need to multiply this up to the scale you are given 2x = 4y 4x = 8y 6x = 12y So you would need 6 grams of element X to make the same compound.
