From a list of almost 2000 names and formulas, students will be given the opportunity to practice their ability to name ionic compounds, given the formula, and determine the formula given the name. In compounds of selenium (where known), the most common oxidation numbers of selenium are: 6, 4, 2, and -2. Hydrides The term hydride is used to indicate compounds of the type M x H y and not necessarily to indicate that any compounds listed behave as hydrides chemically. I've been trying the last hour to delete an element by without any success. Most research shows that people with high levels of selenium, people who eat diets high in selenium, and people who take selenium supplements for many years have an increased risk of type 2 diabetes. Selenium’s legal airborne permissible exposure limit (PEL) is 0.2 mg m-3 averaged over an 8-hour shift. The six electrons in the outermost shell allow selenium to have a variety of valence numbers. A negative ion (anion) is formed after gain of electrons in the atom.A positive ion (cation) is formed after loss of electrons from the atom. In the previous post we have seen “locators in Selenium“. The EPA describes selenium as not classifiable for human carcinogenicity. you should know periodic table, Selenium on 6A grup. The name of the anion is Selenide, and it has a -2 charge. The energy released when an electron is added to the neutral atom and a negative ion is formed. SO, the number of Ion is -2. because to far or difficult to donate 6. Name: Selenium Symbol: Se Atomic Number: 34 Atomic Mass: 78.96 amu Melting Point: 217.0 °C (490.15 K, 422.6 °F) Boiling Point: 684.9 °C (958.05005 K, 1264.8201 °F) Number of Protons/Electrons: 34 Number of Neutrons: 45 Classification: Non-metal Crystal Structure: Hexagonal Density @ 293 K: 4.79 g/cm 3 Color: gray Atomic Structure Property Name Property Value Reference; Molecular Weight: 157.9 g/mol: Computed by PubChem 2.1 (PubChem release 2019.06.18) Hydrogen Bond Donor Count: 0 I'm looking for a generic way to get the next element within Selenium. Symbols and Names of Some Common Polyatomic Ions and One Molecule: NH 4 + ammonium ion: OH-hydroxide ion: CN-cyanide ion: SO 4 2-sulfate ion: O 2 2-peroxide ion: CNO-cyanate ion: HSO 4-hydrogen sulfate ion: C 2 H 3 O 2-acetate ion: SCN-thiocyanate ion: SO 3 2-sulfite ion: ClO 4-perchlorate ion: CO 3 2-carbonate ion: Electron affinity of Selenium is 195 kJ/mol. What is the charge on the selenium ion? Documentation for Selenium. Compound Name. This means is gains two electrons when forming an ion. Common Compounds of Selenium Se [Se +4, Se +6]. And the element can only be reached via class name. Selenium is an umbrella project for a range of tools and libraries that enable and … Selenium is a member of the sulfur family with elements including tellurium and polonium. 1) What is the charge on the ion that Selenium forms in an ionic compound? 3) What other ions are isoelectronic with this noble gas? Selenium side effects. An ionic compound, Barium selenide or BaSe is formed, with the ions Ba2+ and Se2-. Question: Electron Configuration Element Or Ion Name Selenide Ion (Selenium) Bromine Block Membership Noble Gas Electron Configuration [Ar]433d104p 1325 273523843230104p (Selenium Ion Is Se', So There Are Two Extra Electrons) # And Configuration Of Valence Electrons 8 Valence, 4s 4p P-block 1s2 Fluoride Ion Beryllium [Kr]5s 1s 2s 2p 3s 3p64s 3d? I am not sure about this. So, to make selenium to be a stable molecule, it should need to accept 2 electrons. Formula The Overflow Blog Making the most of your one-on-one with your manager or other leadership If the given name is "readonly", the "readOnly" property is returned. “How To Locate Element By Name Locator” 3. Selenium is a mineral found in the soil. What mon atomic ions do barium and selenium make? I was thinking Bromine since again it is closest to Krypton. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Given it's such a useful feature I'd have imagined someone must … “How To Locate Element By ID Locator” 2. Selenium is a powerful mineral that is essential for the proper functioning of your body. Predicted data is generated using the US Environmental Protection Agency’s EPISuite™. For example, the chloride ion (Cl-) is isoelectronic with the noble gas argon at the end of period 3, whereas an aluminum ion (Al3+) is isoelectronic with the noble gas neon at the end of period 2. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. You can also do this by creating a custom ElementLocatorFactory (or simply passing in divA into the DefaultElementLocatorFactory) to see if it's a child of the first div - you would then call the appropriate PageFactory initElements method. Electron Affinity – Selenium. Origin of the name: The name is derived from 'selene', the Greek name for the Moon. Properties: Selenium has an atomic radius of 117 pm, a melting point of 220.5°C, boiling point of 685°C, with oxidation states of 6, 4, and -2. Browse other questions tagged python reactjs selenium ionic-framework or ask your own question. This family has six electrons in the outermost shell. Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.. Long term use of high selenium doses can lead to dangerous side effects. In chemistry and atomic physics, the electron affinity of an atom or molecule is defined as: the change in energy (in kJ/mole) of a neutral atom or molecule (in the gaseous phase) when an electron is added to the atom to form a negative ion. Find Selenium, number 34, and you can see that two spaces to its right is a noble gas. Find the below links on How to find elements on a web page using different types of locators. Jquery has a .next() function and overloads to allow a given type so I imagine there may be a JS based solution available for Selenium. I found this by looking at the periodic table. Selenium, an element required nutritionally in trace quantity, forms compounds analogous to sulfur. Selenium tetrafluoride (Se F 4) is an inorganic compound.It is a colourless liquid that reacts readily with water. I was thinking Krypton because it is a noble gas and it is the closest to Selenium but I am not sure. Meaning of name: selenium: Melting point: selenium: Melting point of the highest fluoride: selenium: Melting point of the hydride: selenium: Menu to … Selenium naturally appears in water and some foods. Selenium specifically has an electron configuration of 2-8-18-6. Name the following ions: SeO4^2- Se^2- HSe^- HSeO3 Selenium forms selnides which contain the ion Se2-. I also found myself in a similar position a couple of weeks ago. 1. If you want to create robust, browser-based regression automation suites and tests, scale and distribute scripts across many environments, then you want to use Selenium WebDriver, a collection of language specific bindings to drive a browser - the way it is meant to be driven. navigation The Selenium Browser Automation Project. Finally, the following commonly mis-capitalized attribute/property names are evaluated as expected: If the given name is "class", the "className" property is returned. Selenium sulfide is a probable carcinogen. Selenium is an essential nutrient that exhibits potent anticarcinogenic properties, and deficiency of selenium may cause certain neurologic diseases. Note: The reason for this behavior is that users frequently confuse attributes and properties. Selenium, when forming an ion, gains two electrons. I hope I helped. 2) What noble gas is isoelectronic with this ion. In this post, we discuss “How To Locate Element By Tag Name Locator”. Selenium WebDriver. Stop taking selenium and call your doctor at once if you have: Many of selenium’s compounds, such as selenates and selenites, are highly toxic. Structure, properties, spectra, suppliers and links for: Selenite ion, 14124-67-5, SeO3(2-), [SeO3](2-). 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