Chemistry, 01.07.2019 05:40 bosskid361

The radioactive isotope 238u decays in a series of nuclear reactions that includes another uranium isotope, 234u, and three lead isotopes, 214pb, 210pb, and 206pb. how many neutrons, protons, and electrons are in each of these five isotopes

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The mentioned isotopes are isotopes of elements Uranium (U) and Lead (Pb). The atomic number of U and Pb are 92 and 82, respectively. When an isotope is reported as U-238 for example, 238 is the mass number, which is the sum of the number of protons and neutrons. Since we know the atomic number, we can find the neutrons from the mass number. For the number of electrons, it is equal to the number of protons because it is neutral.

1. U-238
Number of protons: 92
Number of electrons: 92
Number of neutrons: 238 - 92 = 146

2. U-234
Number of protons: 92
Number of electrons: 92
Number of neutrons: 234 - 92 = 142

3. Pb-214
Number of protons: 82
Number of electrons: 82
Number of neutrons: 214 - 82 = 132

4. Pb-210
Number of protons: 82
Number of electrons: 82
Number of neutrons: 210 - 82 = 128

5. Pb-206
Number of protons: 82
Number of electrons: 82
Number of neutrons: 206 - 82 = 124

Answer from: Quest

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

Answer from: Quest

c. because step up transformer steps up the input voltage i.e increases the input voltage

the number of turns are greater on the secondary side of step up transformer

transformer does not handle dc current

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The radioactive isotope 238u decays in a series of nuclear reactions that includes another uranium i...

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