The Arrangement of Electrons in the Atom An energy level is defined as the fixed energy value that an electron in an atom may have. Bohr’s Theory 1. Electrons revolve around the nucleus in orbitals 2. The electrons in an orbit have a fixed energy Note: Orbitals are also known as energy levels 3. As long as an electron is not in any one particular energy level‚ it neither gains or loses energy 4. When an atom absorbs energy it jumps to a higher energy level Note: They do not remain
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metal has a low melting and boiling point‚ also it is very dense‚ this shows that when reacting with other substances it will be different and this is because it will not react the same the whole time. The other thing is that this elements electron configuration is 11 which is quite low when comparing them to the other elements in the periodic table. However this metal is more reactive than lithium which is a good thing because it is quite strong. This element has three main energy levels and the
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chart. 2. Atomic mass is a decimal. Why? 3. Define Isotope. 4. Positively charged ions are formed as atoms _______________(lose‚ gain) electrons. 5. Calculate the atomic mass of the following sample of Silicon. 92.21 % 28Si‚ 4.70% 29Si‚ and 3.09% 30Si. Answer to 2 decimal places‚ remember units. 6. When an atom gains two electrons‚ it becomes an ion with a charge of __________. Nuclear Chemistry Complete the following nuclear decay reactions. Type of Decay (α‚ β‚ γ) 7. ______________
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Energy and Electron Affinity Ionization Energy is removing an electron Electron Affinity is adding an electron Ionization Energy • Energy required to remove an electron from a ground state atom Ionization Energy of Noble Gases • Noble gases have full orbitals‚ so it is difficult to remove an electron from them. But‚ it does become easier the further away the electrons get from the nucleus. Ionization Energy of Alkali Metals • Alkali Metals only have one valence electron‚ so it does
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3 0‚ 1‚ 2‚ or 3 none of these answers 2. If the wavelength of an electron is equal to the radius of the n=2 orbit in He+‚ what must the velocity of the electron be? A. B. C. D. E. 6.88 x 106 m/s 1.38 x 107 m/s 3.44 x 106 m/s 5.47 x 105 m/s The velocity cannot have an exact value 3. The element seaborgium (Sg) has Z=106. What would you predict the electron configuration to of Sg2+ to be? A. B. C. D. E. The same configuration as rutherfordium (Rh) Z=104 [Rn] 6d4 [Rn] 5f14 6d4 [Rn] 5f14 6d2 7s2
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elements based on their electron configurations. This relates directly to what we have studied in Chapter 5 of our textbook. One example from The Disappearing Spoon was about the halogens group of elements. This group is one of the most reactive of the entire periodic table because the outer shell of electrons in each atom is missing only one electron to be complete‚ or satiated. According to page 16 of The Disappearing Spoon‚ “...each level needs a certain number of electrons to fill itself and feel
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CHEMISTRY 101 FINAL EXAM SECTIONS 572-580 Dr. Joy Heising FORM 4N December 7‚ 2001 Directions: 1. Fill out your scantron sheet. a. Do not forget to include your SIGNATURE and ID number. b. Dept = CHEM‚ Course No. = 101 c. If you want your scores posted‚ mark A under the option column 2. Use a #1 or #2 pencil for marking the answer sheets. circles completely. 3. DO NOT write on the envelope. 4. Read each question carefully‚ then choose the best answer for each question. There is no penalty
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The objective of this experiment is to demonstrate and explore how chemical reactivity is affected by variations in these properties. ~Atomic radius‚ ionization energy‚ electron affinity‚ effective nuclear charge and electronegativity are a just a few such parameters. Part A of this lab deals with the solubility of dissolved ions. The two primary factors involved when an ionic solid is dissolved (dissolution) in water are dissociation and solvation. --Dissociation‚ the separation of the
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UNIT 1 MATTER‚ CHEMICAL TRENDS AND CHEMICAL BONDING UNIT 1 MATTER AND CHEMICAL BONDING 1.1 The Study of Chemistry Chemistry is the study of matter and its properties‚ the changes (chemical‚ physical‚ and nuclear) that matter experiences‚ and the energy that is associated with these changes. The term STSE refers to science‚ technology‚ society‚ and the environment. These four areas are
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Introduction To Scanning Electron Microscopy At the completion of the prac‚ the practical experience of operating a scanning electron microscope is sufficient to operate the particular machine in the future. During the experiment‚ two different gold plated samples are analysed under the SEM and compositional and topographic information is identified and analysed. Both the information is derived by changing the working distance‚ accelerating voltage‚ aperture size‚ probe current‚ resolution and
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