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
In the carbon tetrachloride molecule, four chlorine atoms are positioned symmetrically as corners in a tetrahedral configuration joined to a central carbon atom by single covalent bonds
