Bismuth-209 (209Bi) is the isotope of bismuth with the longest known half-life of any radioisotope that undergoes α-decay (alpha decay). It has 83 protons and a magic number of 126 neutrons, and an atomic mass of 208.9803987 amu (atomic mass units). Of the first 82 elements in the periodic table, 80 have isotopes considered to be stable.[1] The 83rd element, bismuth, was traditionally regarded as having the heaviest stable isotope, bismuth-209, but in 2003 researchers in Orsay, France, measured the half-life of 209
Bi
to be 1.9×1019 years.[2][3] Technetium and promethium (atomic numbers 43 and 61, respectively[a]) and all the elements with an atomic number over 82 only have isotopes that are known to decompose through radioactive decay. No undiscovered elements are expected to be stable; therefore, lead is considered the heaviest stable element. However, it is possible that some isotopes that are now considered stable will be revealed to decay with extremely long half-lives (as with 209
Bi
). This list depicts what is agreed upon by the consensus of the scientific community as of 2019.
Answer:
86.9 g
Explanation:
Use the conversion factor: 4.82 mol H2O x (18.02g H2O/1 mol H2O)
The moles cancel out so we have to multiply 4.82 x 18.02 = 86.9
The answer is 3 sig. figs.
Answer:
; The structures of both compounds are shown in the attached image.
Explanation:
First, compound W has the molecular formula C6H11Cl, it is observed that it does not have double bonds. removal of E2 produces compound Y, which is an alkene, which is hydrogenated and produces a methylcyclopentane.
Compound W is an alkyl halide that undergoes an SN1 reaction with sodium iodide in the presence of acetone forming the corresponding iodine compound.
while compound X is a tertiary alkyl halide, it is sterically restricted to undergo SN2 reactions.
Because they make up everything!!! So yes, atoms and molecules are important to cell processes. In order to make energy, which are ATP molecules, a cell must use glucose (C6H12O6) and six oxygen (O2) molecules to create it.
