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[1] [2] Period 2 has much more conclusive trends. For all elements in period 2, as the atomic number increases, the atomic radius of the elements decreases, the electronegativity increases, and the ionization energy increases. [3] Period 2 only has two metals (lithium and beryllium) of eight elements, less than for any subsequent period both by ...
Period: period 2: Block ... (LiOH and LiOH·H 2 O), lithium nitride (Li 3 N) and lithium carbonate (Li 2 CO 3, the result of a secondary reaction between LiOH and CO ...
Period 4 includes the biologically essential elements potassium and calcium, and is the first period in the d-block with the lighter transition metals. These include iron , the heaviest element forged in main-sequence stars and a principal component of the Earth, as well as other important metals such as cobalt , nickel , and copper .
Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on. Each of these names can be further abbreviated by a one- or two-letter chemical symbol; those for hydrogen, helium, and lithium are respectively H, He, and Li. [6] Neutrons do not affect the atom's chemical identity, but do affect its weight.
The radius increases sharply between the noble gas at the end of each period and the alkali metal at the beginning of the next period. ... lithium: 145 [2] 167 [5 ...
[10]: 90–1 In aqueous solution, the alkali metal ions exist as octahedral hexahydrate complexes [M(H 2 O) 6] +, with the exception of the lithium ion, which due to its small size forms tetrahedral tetrahydrate complexes [Li(H 2 O) 4] +; the alkali metals form these complexes because their ions are attracted by electrostatic forces of ...
Spectral lines of lithium: Other properties; Natural occurrence: primordial: Crystal structure ... E119 [Set 2] period 8 start
See also: Electronegativities of the elements (data page) There are no reliable sources for Pm, Eu and Yb other than the range of 1.1–1.2; see Pauling, Linus (1960).