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Firefox 48 and onwards can make use of the Selenium 3.x builds. Firefox marionette gecko webdriver works only with Selenium 3.x. For Firefox below 48, Selenium 2.x is likely to work. If you're testing the Firefox 48 onwards for Selenium 3, the checkout Java web driver for selenium3. This should show you how to work with new marionette web driver of Firefox.
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Is selenium stable or unstable?
Selenium is generally considered stable in its elemental form. However, some of its isotopes are unstable and undergo radioactive decay.
How many atoms selenium lose?
Selenium typically loses 2 electrons to achieve a stable electron configuration. This results in the formation of a 2+ ion for selenium.
What are the names of common isotopes of selenium?
Selenium has six naturally occurring isotopes, five of which are stable: 74Se, 76Se, 77Se, 78Se, and 80Se. The last three also occur as fission products, along with 79Se, which has a half-life of 327,000 years. The final naturally occurring isotope, 82Se, has a very long half-life (~1020 yr, decaying via double beta decay to 82Kr), which, for practical purposes, can be considered to be stable. Twenty-three other unstable isotopes have been characterized
How many nuetrons are in selenium?
From wikipedia:"Selenium has six naturally occurring isotopes, five of which are stable: 74Se, 76Se, 77Se, 78Se, and 80Se. The last three also occur as fission products, along with 79Se which has a half-life of 295,000 years. The final naturally occurring isotope, 82Se, has a very long half-life (~1020 yr, decaying via double beta decay to 82Kr), which, for practical purposes, can be considered to be stable. Twenty-three other unstable isotopes have been characterized. " 74Se is stable with 40 neutrons 76Se is stable with 42 neutrons 77Se is stable with 43 neutrons 78Se is stable with 44 neutrons 80Se is stable with 46 neutrons see the related link for a complete table on isotopes of selenium.
What bond is formed between potassium and selenium?
Potassium and selenium can form an ionic bond, where potassium will donate an electron to selenium to achieve a stable electron configuration. This results in the formation of potassium selenide (K2Se).
Is selenium stable or unstable?
Selenium is generally considered stable in its elemental form. However, some of its isotopes are unstable and undergo radioactive decay.
How many electrons does selenium need to lose or gain to be stable?
Selenium needs to gain two electrons to achieve a stable electron configuration. By gaining two electrons, selenium will have a complete outer energy level (valence shell), which is the most stable configuration for an atom.
How many atoms selenium lose?
Selenium typically loses 2 electrons to achieve a stable electron configuration. This results in the formation of a 2+ ion for selenium.
What are the names of common isotopes of selenium?
Selenium has six naturally occurring isotopes, five of which are stable: 74Se, 76Se, 77Se, 78Se, and 80Se. The last three also occur as fission products, along with 79Se, which has a half-life of 327,000 years. The final naturally occurring isotope, 82Se, has a very long half-life (~1020 yr, decaying via double beta decay to 82Kr), which, for practical purposes, can be considered to be stable. Twenty-three other unstable isotopes have been characterized
How many nuetrons are in selenium?
From wikipedia:"Selenium has six naturally occurring isotopes, five of which are stable: 74Se, 76Se, 77Se, 78Se, and 80Se. The last three also occur as fission products, along with 79Se which has a half-life of 295,000 years. The final naturally occurring isotope, 82Se, has a very long half-life (~1020 yr, decaying via double beta decay to 82Kr), which, for practical purposes, can be considered to be stable. Twenty-three other unstable isotopes have been characterized. " 74Se is stable with 40 neutrons 76Se is stable with 42 neutrons 77Se is stable with 43 neutrons 78Se is stable with 44 neutrons 80Se is stable with 46 neutrons see the related link for a complete table on isotopes of selenium.
What bond is formed between potassium and selenium?
Potassium and selenium can form an ionic bond, where potassium will donate an electron to selenium to achieve a stable electron configuration. This results in the formation of potassium selenide (K2Se).
What is the charge on the ion that selenium form ionic compound?
selenium has a -2 charge. when it forms a compound with another atom the charge of the compound should be zero unless it has a cahrge in its equation. when compounds form they try to be in the most stable state which is when all their valance elctrons are full which means the charge is zero.
How many electrons does selenium gain?
Selenium gains two electrons to achieve a stable electron configuration, usually by forming ionic compounds in which it takes on a -2 charge.
What ion will be formed by a selenium atom when it has a stable set of valence electrons?
Selenium typically forms an ion with a charge of -2 when it gains two electrons to achieve a stable electron configuration. This forms the selenide ion (Se2-).
Is selenium dichloride covalent bond?
Yes, selenium dichloride (SeCl2) forms covalent bonds. Selenium, being a nonmetal, typically forms covalent bonds by sharing electrons with other nonmetals like chlorine to achieve a stable electron configuration.
What kind of bond is Sulfur and selenium?
Sulfur and selenium form a covalent bond when they bond together, as both are nonmetals. In a covalent bond, the atoms share electron pairs to achieve a stable configuration.
Will selenium form a 2- ion?
Yes it will. Selenium has 6 valence electrons. If it accepts two more electrons to form Se2-, the resulting ion will have octet of electrons in the valence shell and will be stable.
