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![Q2: A/Write the electronic configuration and determine the Valance of the following:
Se (Z= 21)
where; Z: Atomic number
B/ Convert the [102] direction into the four index Miller Bravais scheme for
hexagonal unit cells.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F686ebbf5-15ec-4429-becd-da66829e67c9%2Fa23252d1-f532-4dc6-9cf2-4771bd323885%2F7jkzh1t_processed.jpeg&w=3840&q=75)
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- Sketch the Miller plane in a unit cell (0-1-3).The unit cells of SbCl3 are orthorhombic with dimensions a = 812 pm, b = 947 pm, and c = 637 pm. Calculate the spacing, d, of the {321} planes.The unit cells of SbCI3 are orthorhombic with dimensions a= 812 pm, b = 947 pm, and c = 637 pm. Calculate the spacing of (a) the {321} planes, {b} the {642} planes.
- Calculate the separations of the planes {123} and {236} in an orthorhombic crystal in which the unit cell has sides of lengths 784, 633, and 454 pm.In a certain Patterson map for an orthorhombic crystal, space group P222, with coordinates of equivalent positions at x,y,z; x,y,-z, -x,-y,1/2+z, -x,y,1/2-z, there were high peaks at u,v,w of 0,0,0.74; 0.6,0,0; 0,0.36,0.25, assuming one heavy atom per asymmetric unit, find the coordinates of this heavy atom.A compound orthorhombic cell has cell (a = 588, b = 820 and c = 796 pm). Find the density more precisely as the molar volume is calculated as 130 g / mol.
- An orthorhombic unit cell has dimensions a = 769 pm, b = 891 pm, and c = 690 pm. Calculate the spacing, d, of the {312} planes.In a certain unit cell, planes cut through the crystal axes at (2a, 3b, c), (a, b, c), (6a, 3b, 3c), (2a, -3b, -3c). Identify the Miller indices of the planes.Calcium carbonate crystals in the form of aragonite have orthorhombic unit cells of dimensions a = 574.1 pm, b = 796.8 pm, and c = 495.9 pm. Calculate the values of θ for the (100), (010), and (111) reflections using radiation of wavelength 83.42 pm.
- State the number of atoms on a plane having the miller indices of 110 in a BCC unit cell.Good morning I am recently studying the topic of covalent crystals, I received the task to determine vectorially and explain how to obtain the angle of 109.5 degrees in the tetrahedral geometry? for covalent crystals.Here I share a slide with the information and a small scheme.Thank you very much in advance.The first LEDs were made from GaAs, which has a bandgap of 1.43 eV. What wavelength of light would be emittedfrom an LED made from GaAs? What region of theelectromagnetic spectrum does this light correspond to: ultraviolet,visible, or infrared?