Nov 6, 2020

Pure crystalline boron is a black, lustrous semiconductor; i.e., it conducts electricity like a metal at high temperatures and is almost an insulator at low temperatures. Boiling hydrochloric acid does not affect it, and hot concentrated nitric acid only slowly converts finely powdered boron to boric acid (H3BO3). Algebraic sum : 5 protons, 2 electrons = +3. For a short time after certain boron compounds are injected into a patient with a brain tumour, the compounds collect preferentially in the tumour; irradiation of the tumour area with thermal neutrons, which cause relatively little general injury to tissue, results in the release of a tissue-damaging alpha particle in the tumour each time a boron-10 nucleus captures a neutron. Typical effects of long-term boron deficiency are stunted, misshapen growth; vegetable “brown heart” and sugar beet “dry rot” are among the disorders due to boron deficiency. - helps chemist understanding how elements form chemical bonds. Updates? © 2013 Wayne Breslyn, Method 2: Using the Electron Config. (Left) Icosahedron, basic unit of crystalline boron. Both nuclei possess nuclear spin (rotation of the atomic nuclei); that of boron-10 has a value of 3 and that of boron-11, 3/2, the values being dictated by quantum factors. Boron atomic number = 5 electronic configuration is : 1s2, 2s2, 2px1 or in levels 2 in first level and 3 in second level. Boron occurs combined as borax, kernite, and tincalconite (hydrated sodium borates), the major commercial boron minerals, especially concentrated in the arid regions of California, and as widely dispersed minerals such as colemanite, ulexite, and tourmaline. Boron (B), chemical element, semimetal of main Group 13 (IIIa, or boron group) of the periodic table, essential to plant growth and of wide industrial application. Calculate the mass in grams of O2 at -34 oC. Since 1s can only hold two electrons the next 2 electrons for B goes in the 2s orbital. Boron has an electronic configuration of 1s22s22p1 (it has 5 electrons). with this, the largest number of electrons you can get on a neutrally charged boron is 6 (when boron has 3 bonds). Okay, so if you just at your periodic table, you can see that boron is in group III, so it loses 3 electrons (as group number corresponds to the number of electrons in the atoms outer shell), * (check this question though, it may be a trick question as group III elements do not normally form ions, they use covalent bonding), ANYHOO, if boron loses 3 electons, it forms a 3+ ion, so it's electron configuration would be 1s2. In writing the electron configuration for Boron the first two electrons will go in the 1s orbital. You may be familiar with the chemical symbols for hydrogen and oxygen, but can you match such lower-profile elements as gadolinium and erbium with their corresponding symbols?

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