# Metalloids in the Periodic Table URL: https://sciencestruck.com/chemistry/metalloids-in-periodic-table Category: Chemistry Published: 2010-05-13T01:45:00 Updated: 2010-05-13T01:45:00 Metalloids are elements from the periodic table with properties that lie between metals and non-metals. The following ScienceStruck article will cover some information related to metalloids. The first person to come up with a periodic table of elements was Dmitri Ivanovich Mendeleev, a Russian chemist. He came up with the first version of periodic table in 1864. Mendeleev’s table was based on the atomic weight of the elements. He found that there were many elements that shared similar properties and occurred periodically. Thus, he came up with the concept of periodic table of elements. His table had been divided into three main sections - metals, nonmetals, and metalloids. In this article, we shall concentrate on the metalloids from the periodic table. Classification of Periodic Table According to Mendeleev’s law of periodic table, the chemical and physical properties of elements vary in a periodic fashion according to their atomic weights. However, the modern periodic table of elements follow the law that, the properties of elements vary according to their atomic number and not by their weight. The elements of a Mendeleev’s table were arranged in rows called periods and columns called groups. The chemical elements of the same group had similar properties. There are different regions in the periodic table that are called periodic table blocks, as they are named according to the subshell of the last electron of the atom. Location of Metalloids in the Periodic Table The metalloids, also known as semi-metals, are placed between metals and non-metals in the periodic table of elements. There are seven elements that are classified as metalloids and placed in Group 13, 14, 15, 16, and 17. They are found in a stair step line that helps differentiate metals from non-metals in this element table. The line that separates metalloids from the metals and non-metals in the periodic table is called _amphoteric line_. List of Metalloid Elements As mentioned above, there are 7 elements in the periodic table that exhibit metalloid behavior. They occur in a diagonal line from boron to astatine through the p-block. The elements in the upper-right portion of the line show increasing non-metallic behavior and the elements at the lower-left of the line show increasing metallic behavior. The list of metalloids in the periodic table are as follows: - Boron (B) - Silicon (Si) - Germanium (Ge) - Arsenic (As) - Antimony (Sb) - Tellurium (Te) - Polonium (Po) Metalloids in the Periodic Table _s-block_ Transition Elements _d- block_ _p-block_ Nobel Element Group 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 1 H 1.0079 2 [He](https://sciencestruck.com/chemistry/interesting-facts-about-helium "Helium") 4.0026 2 3 Li 6.941 4 Be 9.0122 5 B 10.811 6 C 12.011 7 N 14.007 8 O 15.999 9 F 18.998 10 Ne 20.180 3 11 Na 22.990 12 Mg 24.305 13 Al 26.982 14 [Si](https://sciencestruck.com/chemistry/silicon-element "Silicon") 28.086 15 P 30.974 16 S 32.066 17 Cl 35.453 18 Ar 39.948 4 19 K 39.098 20 Ca 40.078 21 Sc 44.956 22 [Ti](https://sciencestruck.com/chemistry/titanium-element "Titanium") 47.867 23 V 50.942 24 Cr 51.996 25 Mn 54.938 26 Fe 55.845 27 Co 58.933 28 Ni 58.693 29 Cu 63.546 30 Zn 65.409 31 Ga 69.723 32 Ge 72.64 33 As 74.922 34 Se 78.96 35 Br 79.904 36 Kr 83.798 5 37 Rb 85.468 38 Sr 87.62 39 Y 88.906 40 Zr 91.224 41 Nb 92.906 42 Mo 95.94 43 Tc (98) 44 Ru 101.07 45 Rh 102.91 46 Pd 106.42 47 Ag 107.87 48 Cd 112.41 49 In 114.82 50 [Sn](https://sciencestruck.com/science-facts/interesting-facts-about-tin "Tin") 118.71 51 Sb 121.76 52 Te 127.60 53 I 126.90 54 Xe 131.29 6 55 Cs 132.91 56 Ba 137.33 57 - 71 La-Lu 72 Hf 178.49 73 Ta 180.95 74 W 183.84 75 Re 186.21 76 Os 190.23 77 Ir 192.22 78 Pt 195.08 79 Au 196.97 80 Hg 200.59 81 Tl 204.38 82 Pb 207.2 83 Bi 208.98 84 Po (209) 85 At (210) 86 Rn (222) 7 87 Fr (223) 88 Ra (226) 89 -103 Ac-Lr 104 Rf (261) 105 Db (262) 106 Sg (266) 107 Bh (264) 108 Hs (277) 109 Mt (268) 110 Ds (281) 111 Rg (272) 112 Cn (277) Lanthanide 57 La 138.91 58 Ce 140.12 59 Pr 140.91 60 Nd 144.24 61 Pm (145) 62 Sm 150.36 63 Eu 151.96 64 Gd 157.25 65 Tb 158.93 66 Dy 162.50 67 Ho 164.93 68 Er 167.26 69 Tm 168.93 70 Yb 173.04 71 Lu 174.97 Actinide 89 Ac (227) 90 Th 232.04 91 Pa 231.04 92 U 238.03 93 Np (237) 94 Pu (244) 95 Am (243) 96 Cm (247) 97 Bk (247) 98 Cf (251) 99 Es (252) 100 Fm (257) 101 Md (258) 102 No (259) 103 Lr (262) Key for the Periodic Table Alkali Metals Alkaline Earth Metals Lanthinides Actinides Transition Metals Poor Metals Other Metals Nobel Gases Metalloids Unknown Chemical Properties Properties of Metalloids The term metalloid comes from the Greek word _metallon_, which means ‘metal’, and _edios_, meaning ‘sort.’ The metalloids are often seen forming amphoteric oxides, and they behave as semiconductors. They have properties of both metals and non-metals in the periodic table. They even carry electric charge that makes them suitable for use in computers and calculators. Their ionization energy as well as electronegativity values are between those of metals and non-metals. Their reactivity depends on the metals that they are reacting with. As you can see in the periodic table, there is a line that distinguishes boron and aluminum to the border seen between polonium and astatine. However, aluminum is classified under ‘other metals’. The element carbon is a non-metal, but graphite displays limited conductivity, which is the characteristic of a metalloid. Silicon and germanium exhibit properties of a semiconductor. When boron reacts with sodium, it acts as a non-metal, whereas in case of reaction with fluorine, boron exhibits metallic properties.