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Was polonium the first source of radioactivity?
All isotopes of polonium (all 25 of them) are radioactive. Only traces of a single isotope exist in nature.
How many protons and electrons does Neptunium have?
Neptunium is a chemical element with the symbol Npand atomic number 93.So it has 93 protons and the neutral atom has also 93 electrons.It is a radioactive metallic element, the first transuranic element and it belongs to the actinide series. Its most stable isotope is 237Np, with 237-93=144 neutrons
Is holmium radioactive?
Holmium actually has the highest magnetic strength out of all known elements given it is first submersed in an artificially produced magnetic field.
What are AMU's based on?
The answer to this question is Hydrogen. If you have an periodic table, you will see that the only element with a mass close to 1 is Hydrogen, and that is because 1 atom of Hydrogen weighs 1 Atomic Mass Unit. --------------------------------------- The first answer is not correct ! The atomic mass unit is 1/12 from the atomic mass of the isotope 12C in his ground state.
If a radioactive isotope in a rock has a half-life of 10000 years and the ratio of radioactive parent to stable daughter is 1 to 3 how old is the rock?
At the time the rock is created, the radioactive isotope is present in that rock in a ratio of 1 to zero with regard to the stable daughter. After one half-life, which is 10,000 years, the isotope to daughter ratio is 1 to 1. After another half-life, which is another 10,000 years, the ratio is 1 to 3. The rock is 20,000 years old.To see it another way, after the first half-life is complete, half the material is the original isotope, and half is the daughter. That's a 1 to 1 ratio. After another half-life (another 10,000 years) has passed, half the original isotope that was left has become the daughter. That's one quarter more of the daughter that will be added to the quantity of the daughter existing after the first half-life. That means that one quarter of the original isotope will be left after 2 half-lives, and the rest (the other 3/4ths of the material) will be the daughter. The ratio of the original isotope to the daughter after 2 half-lives (20,000 years) is 1 to 3.
What is the average atomic mass of an element is the average atomic masses of what kind of isotopes?
average atomic massof an element=(Atomic mass of first isotope X % of that isotope) + (Atomic mass of second isotope X % of the second isotope)
What is the first radioactive element that forms when uranium 238 decays?
The isotope 234 Th.
Was polonium the first source of radioactivity?
All isotopes of polonium (all 25 of them) are radioactive. Only traces of a single isotope exist in nature.
Why radioactive decay is always first order reaction?
This is because only one isotope decay.
When did the atomic number first appear on the periodic table?
The first atomic number appeared on the periodic table in August 1982. The first atom of the element meitnerium had the atomic number 109. The isotope of element 109 has an atomic mass of 266.
First element known to be radioactive?
Radium (Ra) atomic number 88
Compared to the length of time for the first half-life of a sample of a radioactive isotope the length of time for the second half-life is?
the same
What is the mass number of the first nitrogen isotope?
Nitrogen is a non metal element. Atomic mass number of it is 14.
What is the first radioactive element number?
Of elements that have no stable isotopes, technetium has the lowest atomic number, which is 43.
Calculate the average atomic mass of an unknown element that has two naturally-occurring isotopes The first isotope occurs 75.47 percent of the time and has a mass of 248.7 amu The second isotope occu?
the atomic mass is -(248.90)
How many valence electrons has hassium?
Hassium is a synthetic element with the symbol Hs and atomic number 108.The isotope 265108Hs was the first known synthesized of all,that one has 265 (mass) - 108 (protons) = 157 neutronsIt is just one of the many possible but very unstable isotopes
How many protons and electrons does Neptunium have?
Neptunium is a chemical element with the symbol Npand atomic number 93.So it has 93 protons and the neutral atom has also 93 electrons.It is a radioactive metallic element, the first transuranic element and it belongs to the actinide series. Its most stable isotope is 237Np, with 237-93=144 neutrons
