Question

29. A section of the periodic table with all identification features removed is shown below. X Y Z Which element has the smallest atomic radius? A. W В. Y С. Х D. V 30. Which of the following elements would be expected to have chemical and physical properties most similar to those of the krypton (Kr)? A. Neon (Ne) B. Gallium (Ga) C. Sodium (Na) D. Tin (Sn) art II (10 points in total) ou must show all the work to receive complete credits. What is the wavelength of a photon having a frequency of 59.3 THz? (1 THz = 1015 Hz) (3 points) What is the frequency of a photon having an energy of 2.91 x 10-17 J? (3 points) at is the wavelength of a neutron traveling at a speed of 4.54 km/s? What would be th ons of the spectrum for electromagnetic radiation of this wavelength? (4 points) = of a neutron =1.6749 x 10-27 kg

Answer 1

* x bas smallest Radius: * In periodic Table teft to right (periods) Radius decreases of top to bottom (groups) Radius increases Kryplon (kr) & Neon (ne) has same physical a Chemical properties due to both are belongs to VIA Group Elements © Given v= 59.3 THB r = 59.3 x105 H2 C = 3x108 mis d = ? x = 0 = 29.3x10'5 x= 0.050s x 10 =505 x10 m

& Energy E-4.91Tots h=6.625 410 Mg.s E=no 20 - 2.91x10!? I 1 6625x1034 Jos = 0.439 x 1673