Interpretation:
The elements,
Concept Introduction:
According to physical and chemical properties, the elements can be further divided into metals, non-metals and metalloids.
In a group, the metallic character of an element increases from top to bottom whereas in a period, it decreases from left to right.
Metals are elements that usually contain 1-3 outer shell electrons. Metals look shining and lustrous and are malleable and ductile. They are also good conductors of heat and electricity. They have low ionization energy and tend to lose electrons forming cations. They are most likely to form ionic compounds.
Nonmetals are elements that usually contain 4-8 outer shell electrons. They cannot conduct heat and electricity and are brittle. Also they have high
Metalloids are elements having intermediate properties of metals and nonmetals. Comparing to metals, metalloids are poor conductors but under certain conditions they can act as electrical conductors. They look shining and lustrous like metals yet they are brittle like nonmetals.
The classification elements in the periodic table as metals, nonmetals, or metalloids can be given as
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Chemistry
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- A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogen-like ion are given by (2.180 × 10-¹5 1) 2² (1) J) E = kJ where n is the principal quantum number, and Z is the atomic number of the element. Calculate the ionization energy, in your answer to 4 significant digits. mol Note: Reference the Fundamental constants table for additional information. ·2+ of the Li²+ ion. Round Iarrow_forwardWhich of the following atoms and ions is (are) isoelectronic with Si: Ar, S2+, Ne, Al3+, P3−, As3+?arrow_forwardIs bromine (Br) a metal, a nonmetal, or a metalloid? Does bromine have a higher or lower electron affinity than selenium?arrow_forward
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