Families alkali metals

Elements observed in this activity (copper, iron, cobalt, nickel, zinc, sodium, magnesium, calcium, bromine, and iodine) belong in the following families alkali metals, alkaline earth metals, transition metals and halogens. Place each element in its proper family. Is there any relationship between the element s family and the element s color ... 

Family Alkali Metal Physical State Solid... 

Identify in the periodic table the following chemical families alkali metals, alkaline earths, halogens, noble gases. 

Figure 11.20 The alkali metal and alkaline earth metal families. Alkali metal atoms (Group 1A/1) have the valence electron configuration ws. Alkaline earth atoms (Group 2A/2) have the valence electron configuration... 

COAL 17 Identify in the periodic table the following chemical families alkali metals, alkaline earths, halogens, noble gases. COAL 18 Predict how and explain why atomic size varies with position in the periodic table. 

The person whose name is most closely associated with the periodic table is Dmitri Mendeleev (1836-1907), a Russian chemist. In writing a textbook of general chemistry, Mendeleev devoted separate chapters to families of elements with similar properties, including the alkali metals, the alkaline earth metals, and the halogens. Reflecting on the properties of these and other elements, he proposed in 1869 a primitive version of today s periodic table. Mendeleev shrewdly left empty spaces in his table for new elements yet to be discovered. Indeed, he predicted detailed properties for three such elements (scandium, gallium, and germanium). By 1886 all of these elements had been discovered and found to have properties very similar to those he had predicted. 

Dioxytetrafluoroniobates (-tantalates) of alkali metals for the general M3Me02F4 type also belong to the family characterized by X Me=6. Structural characteristics of the compounds are collected in Table 26. 

A family of recently published Cp complexes sheds a more detailed light on the role of the donors on the overall structural pattern. Demonstrated with a group of Cp derivatives in the presence of the crown ethers 15-crown-5 and 18-crown-6, monomeric complexes may be obtained in the form CpNa(15-crown-5) 84. In a parallel fashion, 18-crown-6 has been shown to be effective in supporting monomeric structures of the heavier alkali metals bound to Cp. Examples include CpM(18-crown-6) (M = K 85, Rb 86, Cs 87).100 101... 

If the seventh period of the periodic table is 32 members long, it will be the same length as the sixth period. Elements in the same family will have atomic numbers 32 units higher. The noble gas following radon will have atomic number = 86 + 32 = 118. The alkali metal following francium will have atomic number = 87+32 = 119. 

However, when examining the alkali metal family, one discovers that the melting point... 

As one moves down the alkali metal family, the charge density would be expected to decrease due to significantly larger volume and more shielding. 

The IA family is known as the alkali metals the ILAs are the alkaline earth metals the VIIAs are the halogens and the VIIIAs are the noble gases. 

Figure 4.2. The Periodic Table special collective names. The informal symbols of these families of elements are A = alkali metals, Ae = alcaline earth metals, Ln = lanthanides R = rare earth metals = Sc + Y + lanthanides, An = actinides, Hal = halogens, Chal = chalcogens,...

A review about the Zintl phases has been published by Sevov (2002) from the introduction of this publication we quote a few remarks. It was preliminary observed that the number of Zintl phases has increased many-fold since Zintl s time and that the definition of a Zintl phase has never been very exact often compounds that include non-metals have been considered in this family. The paper by Sevov is mainly dedicated to clearly intermetallic Zintl phases (that is phases containing main group metals, semi-metals or semiconductors only). Attention has therefore been dedicated to compounds of alkali metals with the elements of the 13th, 14th and 15th groups (without B, Al, C, N and P). To this end the following definitions and statements have been considered. 

The lack of homopolyatomic anions for elements to the left of group IV In Table I is noteworthy. Zlntl reported no success with reactions of alkali metal alloys of the copper and zinc family elements and of thallium with liquid ammonia, and the generally stabilizing effect of crypt has not been evident In our own Investigations of alloys of mercury and thallium. On the other hand. It is possible to Isolate a white crypt-potassium gold compound from ammonia solutions at low temperatures which decomposes to elemental gold (+ ) above about -10°C (30). 

Monensin belongs to the family of polyether ionophores. These compounds consist of a series of tetrahydrofuran and tetrahydro-pyran rings and have a carboxyl group that forms neutral salts with alkali metal cations. Their three-dimensional structure presents a lipophilic hydrocarbon exterior with the cation encircled in the oxygen-rich interior. They probably act by transporting cations through the lipid bi-layer of cell membranes, thereby preventing the concentration of potassium by the cells. Evidence for this is... 

When we examine the melting points of all the elements, we find that they fall into different families, such as noble gases, alkali metals, and halogens. The noble gases of group 18 have very low melting points, which increases with the period in the... 

As one moves down the halogen column, one notices that the boiling point increases. However, when examining the alkali metal family, one discovers that the melting point decreases as one moves down the column. 

Zeolites are crystalline aluminosilicates whose primary structure is formed by Si04 and A104 tetrahedra sharing the edges . Their tertiary structure forms uniform channels and cavities of molecular dimensions that are repeated along the zeolite lattice. Due to the lower valence of the aluminium relative to silicon, the excess negative charge (one per A1 atom) is balanced by alkali metal cations, mainly Na". An important class of the zeolite family are the faujasites, known as zeolites X and Y, which have the typical composition for the unit cell as follows ... 

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