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A rough estimate of the radius of a nucleus is provided by the formula
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Principles of Modern Chemistry
- Mass spectrometric analysis showed that there are four isotopes of an unknown element having the following masses and abundances: Three elements in the periodic table that have atomic weights near these values are lanthanum (La), atomic number 57, atomic weight 138.9055; cerium (Ce), atomic number 58, atomic weight 140.115; and praseodymium (Pr), atomic number 59, atomic weight 140.9076. Using the data above, calculate the atomic weight, and identify the element if possible.arrow_forward2-73 (Chemical Connections 2D) Copper is a soft metal. how can it be made harder?arrow_forwardWhat evidence led to the conclusion that cathode rays had a negative charge?arrow_forward
- Balance the following equations by filling in the blanks. (a) 92235U+01n54137_+201n+_ (b) 90232Th+612__01n+96240Cm (c) 24He+4296Mo43100_+_ (d) _+12H84210_+01narrow_forward5 g of anhydrous strontium nitrate is added to a beaker and exposed to the air. After several hours the beaker and the contents are weighed. It was found that the mass increased by 1.70 g. Assume that the increase in mass is totally due to the absorption of water by the anhydrous compound. What is the percentage of water in the hydrated sample?arrow_forwardDetermine the number of protons and neutrons in each of the following isotopes. 223 Rn 86 Express your answers as integers. Enter your answers separated by a comma. 197Au 97 Express your answers as integers. Enter your answers separated by a comma. 15N 7 Express your answers as integers. Enter your answers separated by a comma. 24 Na 11 Express your answers as integers. Enter your answers separated by a comma.arrow_forward
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