Which of the following are true statements regarding isotopes?
The atoms of a chemical element can exist in different types. These are called isotopes .They have the same number of protons (and electrons) but different numbers of neutrons.Different isotopes of the same element have different masses. Mass is …
There are three known stable isotopes of oxygen ( 8 O): 16 O 17 O and 18 O . Radioactive isotopes ranging from 11 O to 26 O have also been characterized all short-lived. The longest-lived radioisotope is 15 O with a half-life of 122.24 seconds while the shortest-lived isotope is 12 O with a half-life of 580 (30)×10 −24 seconds (the half-life of the unbound 11 O is still unknown).
Isotopes of hydrogen - Wikipedia
Isotopes of potassium - Wikipedia
Isotopes of carbon - Wikipedia
Isotope - Simple English Wikipedia the free encyclopedia
Although there are nine known isotopes of helium (2He) (standard atomic weight: 4.002602(2)) only helium-3 ( He ) and helium-4 ( He ) are stable. All radioisotopes are short-lived the longest-lived being He with a half-life of 806.7 milliseconds. The least stable is He with a half-life of 7.6×10 s although it is possible that He has an even shorter half-life. In the Earth's atmosphere there is one He atom for every million He atoms. However helium is unusua…
Carbon (6 C) has 15 known isotopes from 8 C to 22 C of which 12 C and 13 C are stable.The longest-lived radioisotope is 14 C with a half-life of 5 730 years. This is also the only carbon radioisotope found in nature—trace quantities are formed cosmogenically by the reaction 14 N + 1 n → 14 C + 1 H. The most stable artificial radioisotope is 11 C which has a half-life of 20.364 minutes.
Potassium (19 K) has 26 known isotopes from 31 K to 57 K with the exception of still-unknown 32 K as well as an unconfirmed report of 59 K. Three of those isotopes occur naturally: the two st...
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