Answer:1.Hydrogen: 1s1 2 - Helium: 1s245 – Rhodium: [Kr], 5s2, 4d7 46 – Palladium: [Kr], 5s2, 4d847 – Silver: [Kr], 5s2, 4d9 48 – Cadmium: [Kr], 5s2, 4d1049 – Indium: [Kr], 5s2, 4d10, 5p1 50 – Tin: [Kr], 5s2, 4d10, 5p2Thus 43 electrons, so the neutral atom has atomic number 43. Look at a periodic table and you see that this element is technetium.Element Atomic Number Element Symbol Element Electron Configuration45 Rh [Kr] 4d8 5s146 Pd [Kr] 4d1047 Ag [Kr] 4d10 5s148 Cd [Kr] 4d10 5s2...

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