Lithium atomic radius

The weakness of the covalent bond in dilithium is understandable in terms of the low effective nuclear charge, which allows the 2s orbital to be very diffuse. The addition of an electron to the lithium atom is exothermic only to the extent of 59.8 kJ mol-1, which indicates the weakness of the attraction for the extra electron. By comparison, the exother-micity of electron attachment to the fluorine atom is 333 kJ mol-1. The diffuseness of the 2s orbital of lithium is indicated by the large bond length (267 pm) in the dilithium molecule. The metal exists in the form of a body-centred cubic lattice in which the radius of the lithium atoms is 152 pm again a very high value, indicative of the low cohesiveness of the metallic structure. The metallic lattice is preferred to the diatomic molecule as the more stable state of lithium. 

Arrange the elements in the following sets in order of decreasing atomic radius (a) lithium, carbon, fluorine (b) scandium, vanadium, iron (c) iron, ruthenium, osmium (d) iodine, bromine, chlorine. 

From the electron configurations we can see that lithium is in the 2nd period, group 1A, and potassium is in the 4th period, group 1A. Since lithium is above potassium in the same group, the atomic radius of lithium is smaller than that of potassium but the first ionization energy is higher. 

T, F Lithium has a larger atomic radius than fluorine because fluorine has a greater nuclear charge. This allows fluorine to hold electrons closer to the nucleus. 

Moving from lithium to fluorine in period 2, the atomic radius decreases. 

Which has the largest atomic radius carbon (C), fluorine (F), beryllium (Be), or lithium (Li) Do not use Figure 6-11 to answer the question. Explain your answer in terms of trends in atomic radii. 

Lithium Trace amounts of lithium, the lightest alkali metal, are found in water, soil, and rocks. Lithium is the least reactive of the alkali metals. Its compounds are less likely to dissolve in water. In these and other properties, lithium is more closely related to magnesium than to the other alkali metals. Lithium has an atomic radius of 152 pm and an ionic radius of 76 pm. Magnesium has an atomic radius of 160 pm and an ionic radius of 72 pm. These similar physical properties lead to similar chemical properties, which is why lithium and magnesium have a diagonal relationship. 

Fig. 1 a. Projection of the dianion 180 of the a-phase and its associated lithium atoms normal to the aromatic plane. Hydrogen atoms are shown as spheres of radius 0.1 A b The full molecule 180 of the a-phase projected through the dianion plane... 

Obtain a 96-weU microplate, straws of a size to fit the wells in the plate, scissors, and a ruler. The well plate should be oriented to correlate with the periodic table of the elements in the following way Row 1 of the plate represents the first period, HI as hydrogen, A1 as helium Row 2 of the plate represents the second period, from H2 (lithium) to A2 (neon). Rows 3 to 7 correlate with Periods 3 to 7 however, only the main group elements will be represented. Label the well plate Atomic radius in pm (picometers). 

Use the graph of atomic radius versus period number to answer these questions. How does the size of a lithimn atom compare with that of a cesium atom How does the size of a fluorine atom compare with that of an iodine atom Which has the larger radius, lithium or fluorine Based on their atomic radii, which is the most active alkali metal Which is the most active halogen Explain. 

Why is the radius of the lithium atom considerably larger than the radius of the hydrogen atom ... 

Example 7.9 Among the elements of the first group of the periodic table, only organometallic compounds of lithium show a considerable tendency to give stereospecific catalysts. Also, this tendency decreases with increasing atomic radius of the elements of this group. Explain this observation. 

Which is larger, the hydrogen Is orbital or the lithium Is orbital Why Which has the larger radius, the hydrogen atom or the lithium atom Why ... 

---