Chapter 2 Atom Structure Exercises 1. What is the wavelength of a neutron traveling at a speed of 3. 90 km-s-? Neutrons of these speeds are obtained from a nuclear pile How many subshells are there in the m shell? How many orbitals are there in the f subshell? 3. Which of the following electron configurations are possible? Explain why the others are not (1)1s2s2p5(2)1s2s2p3s53d°(3)1s32s2p(4)ls2s2p3s23d0 4. Thallium has the ground-state configuration [Xe)4f145d106s26pl. Give the group and period for this element. Classify it a main-group, a d-transition, or an f-transition element 5. With the aid of a periodic table, arrange the following in order of increasing (2)Ca, Ge (3)P, As, s 1. The mass of the neutron. mn =1.67x10-27kg, therefore the wavelength of a neutron raveling at a speed of 3.90 km s"is obtained by using the de broglie relation: 2=102 nm 2. For M shell. n=3. so where there are 3 subshells. As/=3 for f subshell. the num ber of bitals is 21+1=7 3. All the electron configurations are possible except that one in answer (3), which allows 8Chapter 2 Atom Structure Exercises 1. What is the wavelength of a neutron traveling at a speed of 3.90 km·s-1 ? Neutrons of these speeds are obtained from a nuclear pile. 2. How many subshells are there in the M shell? How many orbitals are there in the f subshell? 3. Which of the following electron configurations are possible? Explain why the others are not. (1) 1s22s12p6 (2) 1s22s22p63s13d6 (3) 1s22s22p8 (4) 1s22s12p63s23d10 4. Thallium has the ground-state configuration [Xe]4f145d106s26p1. Give the group and period for this element. Classify it a main-group, a d-transition, or an f-transition element. 5. With the aid of a periodic table, arrange the following in order of increasing electrnegativity: (1) Sr, Cs, Ba (2) Ca, Ge, Ga (3) P, As, S Answers 1.The mass of the neutron, mn = 1.67×10-27 kg, therefore the wavelength of a neutron traveling at a speed of 3.90 km·s-1 is obtained by using the de Broglie relation: λ = 102 nm 2.For M shell, n = 3, so where there are 3 subshells. As l = 3 for f subshell, the number of orbitals is 2l+1 = 7. 3.All the electron configurations are possible except that one in answer (3), which allows 8