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Farrell ; James Spencer. Diagram of a Na atom using the shell model a and the core charge concept b. How does the core charge for Na compare to the core charge for Li? Based on your answer to CTQ 13 and the ionization energy data, Table 1 of ChemActivity 4: Shell Model I , is the radius of the valence shell of Na larger, smaller or the same as the radius of the valence shell of Li? Consider the models of Ne and Na shown in Models 4 and 5. This decrease is analogous to and similar in magnitude to that observed in going from He to Li.

Note that the ionization energy of Na is only 0. Critical Thinking Question Use the core charge concept to propose an explanation for the increase of IE1 from Na through Ar. Clearly state any assumptions that you make. In fact, for Groups 1A through 7A, the atoms in each group all have the same number of valence electrons, and that number is reflected by the group number. In all cases, the ionization energy decreases as we move down the group. This pattern is also observed in Group 8A, the Noble or Inert gases.

Helium has only 2 electrons, a seeming violation of the pattern we have uncovered. The resolution of this apparent inconsistency is that although He has only 2 valence electrons, its valence shell is completely filled. The same is true of Ne, although for Ne a filled valence shell has 8 electrons. Thus, we find that the structure of the elements using this shell model is reflected in the placement of the elements in the periodic table. Atomic Properties of Various Atoms. Locate H, Li, and Na on the periodic table.

Construct a shell model diagram of F that is consistent with the information in Table 1. Locate F and Cl on the periodic table. Based on its position in the periodic table, what is the valence shell and what is the core charge for C?


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How does the core charge on the neutral atom change as we move from left to right across a row period of the periodic table? Within our model and referring to the Coulombic Potential Energy expression, explain why the IE increases from left to right across a row of the periodic table. How many valence electrons are there in: a C?

Chemistry: A Guided Inquiry

What is the core charge for: a C? In this respect it is very similar to a He atom. In this respect it is very similar to a Ne atom. How would you expect the ionization energy of a F— anion to compare to that of a Ne atom? Predict the order of the ionization energies for the atoms Br, Kr, and Rb.

The radius of the outer shell in Li is larger than the radius of the inner shell.

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Which electron is harder to remove—the valence electron or one of the inner shell electrons? Explain how the model of the structure of Be having the fourth electron in a third shell, further from the nucleus than any of the three electrons in Li, is not consistent with the experimentally obtained ionization energies. Model 1: Atomic Properties and the Periodic Table. Ionization energies increase as the core charge increases across a row period of the periodic table. Ionization energies increase when the core charge remains the same and the valence electrons are in a shell closer to the nucleus that is, up a column group of the periodic table.

We have seen that there are trends in a physical property, IE1, related to the position of the elements in the periodic table. Many other physical and chemical properties of the elements in a particular group, such as the alkali metals or the halogens, are relatively similar. This suggests that many properties of an atom are related to the number of valence electrons present. The nuclear charge and core charge can also be important in determining atomic characteristics because this determines the strength of attraction between the nucleus and the valence electrons.

Chemistry: A Guided Inquiry

This was the basis for our previous analysis of first ionization energies. One measure of the size of an atom or ion is the covalent radius of the atom. This can be thought of as the radius of the outermost shell of an atom or ion. Atomic radii of various atoms.

What is the relationship between the valence shell of each atom in Table 1 and its position in the periodic table? ChemActivity 6 Atomic Size 41 2. Why does the core charge increase as one moves from left to right across a period in the periodic table—for example, from boron to carbon to oxygen?

What trend in atomic radius is observed as one moves from left to right across a period? Explain why this trend exists. What trend in atomic radius is observed as one moves down a group in the periodic table? Estimate the radii of three atoms not listed in Table 1, based on the data presented. Explain how you are able to estimate these values from the data given.

Table 2. Ionic radii of various isoelectronic ions. How many electrons do the ions in Table 2 have? What is the basis for the trend in ionic radii seen in Table 2? Predict which is larger: the O2— ion or the F— ion. Table 3. Atomic radii of various atoms and ions. Therefore, as extra electrons are added to the valence shell of an atom or ion , the radius of the atom or ion increases.

Similarly, as electrons are removed from an atom or ion , the radius of the atom or ion decreases. Critical Thinking Questions Provide a shell model diagram for F— showing all electrons explicitly. Then show how the core charge of F— was calculated Table 3. Explain why the radius of F— is larger than the radius of F. Predict the radius of N3—. What are three characteristics of an atom or ion which must be considered in determining its relative radius?

ChemActivity 6 Atomic Size 43 Exercises 1. Based on the data in Tables 1 and 2, estimate the radius of each of the following species. Which is the smaller species in each of the following groupings? Which is the largest species in each of the following groupings? Which of the following elements should have the largest second ionization energy?

Na; Mg; Al; Si; P. Mg atoms are larger than S atoms. The figure below represents part of a wave. The entire wave can be thought of as extending infinitely in both directions. On the figure above, draw a line connecting two points whose separation is equal to the wavelength of the wave. If there is more than one way to do this, draw a second line.

The frequency f of a wave is defined as the number of wavelengths per second which travel past a given point. Hint: consider how you determined answers to CTQ 2ab.