By using some examples, the valence electrons of some elements should be derived with the help of the location of element in the periodic table. Concept Introduction: Periodic table shows the arrangement of elements in order of increasing atomic number . The horizontal rows are periods and vertical rows, or columns are groups. The elements are represented by symbols with atomic number and atomic mass . The element is in its most stable state as it is represented in the periodic table. The group number helps in identifying the valance electrons and some properties of the element. There are four blocks in which elements are categorized in the periodic table and they help in writing electron configuration of most of the elements. Electron configuration describes the arrangement of electrons within the orbitals and sub orbitals of an atom. Valence-electron configuration is how electrons are arranged in the outermost shell.

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Technetium is the first element in the periodic chart that does not have any stable isotopes. Technetium-99m is an especially interesting and valuable isotope as it emits a gamma ray with a half life ideally suited for medical tests. It would seem that the decay of technetium should fit the treatment above with the result In(c/c) = -kt. The table below includes data from the two sites: http://dailymed.nlm.nih.gov/dailymed/druginfo.cfm?id=7130 http://wiki.medpedia.com/Clinical: Neutrospec_(Technetium_(99m Tc)_fanolesomab). a. b. C. Graph the fraction (c/c.) on the vertical axis versus the time on the horizontal axis. Also graph In(c/c.) on the vertical axis versus time on the horizontal axis. When half of the original amount of starting material has hours fraction remaining disappeared, c/c = ½ and the equation In(c/c.) = -kt becomes In(0.5) = -kt1/2 where t₁₂ is the half life (the time for half of the material to decay away). Determine the slope of your In(c/c.) vs t graph and…

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Chapter 12, Problem 26CR

Interpretation Introduction

Interpretation:

By using some examples, the valence electrons of some elements should be derived with the help of the location of element in the periodic table.

Concept Introduction:

Periodic table shows the arrangement of elements in order of increasing atomic number. The horizontal rows are periods and vertical rows, or columns are groups. The elements are represented by symbols with atomic number and atomic mass. The element is in its most stable state as it is represented in the periodic table. The group number helps in identifying the valance electrons and some properties of the element.

There are four blocks in which elements are categorized in the periodic table and they help in writing electron configuration of most of the elements.

Electron configuration describes the arrangement of electrons within the orbitals and sub orbitals of an atom. Valence-electron configuration is how electrons are arranged in the outermost shell.

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Technetium is the first element in the periodic chart that does not have any stable isotopes. Technetium-99m is an especially interesting and valuable isotope as it emits a gamma ray with a half life ideally suited for medical tests. It would seem that the decay of technetium should fit the treatment above with the result In(c/c) = -kt. The table below includes data from the two sites: http://dailymed.nlm.nih.gov/dailymed/druginfo.cfm?id=7130 http://wiki.medpedia.com/Clinical: Neutrospec_(Technetium_(99m Tc)_fanolesomab). a. b. C. Graph the fraction (c/c.) on the vertical axis versus the time on the horizontal axis. Also graph In(c/c.) on the vertical axis versus time on the horizontal axis. When half of the original amount of starting material has hours fraction remaining disappeared, c/c = ½ and the equation In(c/c.) = -kt becomes In(0.5) = -kt1/2 where t₁₂ is the half life (the time for half of the material to decay away). Determine the slope of your In(c/c.) vs t graph and…

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1. a) Assuming that an atom of arsenic has hydrogen-like atomic orbitals, sketch the radial probability plots for 4p and 4d orbitals of S atom. Indicate angular and radial nodes in these orbitals. (4 points) b) Calculate Zeff experienced by and electron in 4p AO's in a arsenic atom. Use Slater rules that were discussed in lecture. (3 points)