Question
uitiple Choice, 3 points each (30 Points total) 6. 6. If a neutral atoms has an elect If a neutral atons has an electron configaration of is atom has an electron configuration of 1.2waps3p, which ut the a. It's a Silicon atom in the ground state b. It's an Aluminum atom in an excited state c. it's a Silicon atom in an excited state d. It's an Aluminum atom in the ground state ic of the following quantum numbers are not possible for sn electron in the ne3 state of Hydrogen) T Which of the following quantum numhers are not quantum numbers are written in the form (n, 1, m, m) 7. 228Ra AC+X ctX 8. 8. Identify the unknown X in the following radioactive decay: 228 Identify the unknown X in the following radioactive decay: a. He b. e d. 28Ni"X+1 l dantifu the unknown isotope X in the following decay: 28 wn isotope X in the following decay: fit the unkno
Explanation / Answer
8. On decay of Ra to Ac, the unknown X is gamma particle. This is due to reason that atomic number has increased by one unit without changing atomic mass of it.
i.e. option (d) is correct.
