what valence electrons does helium have?
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Helium has 2 electrons --- both in the first shell (so two valence electrons). Lithium has 3 electrons --- 2 in the first shell, and 1 in the second shell (so one valence electron). Beryllim has 4 electrons --- 2 in the first shell, and 2 in the second shell (so two valence electrons).
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A helium atom consists of a nucleus containing two positively charged protons and two neutrons, encircled by two orbiting electrons which carry a negative charge. A hydrogen atom has just one proton and one electron.
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Noble gases all have a complete octet (eight valence electrons), except for helium (which has only two electrons). Because this configuration is extremely stable as well as symmetrical, the noble gases are very unreactive.
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How many valence electrons does oxygen (O) have? A: Any element in group 1 has just one valence electron. Examples include hydrogen (H), lithium (Li), and sodium (Na). Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons).
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In any event, you must start with Xe and 4 O atoms, and note that there are 8 + 4x6 = 32 total valence electrons. The Xe atom is attached to all four oxygen atoms. Four bonds = 8 electrons, so you have 24 electrons left.
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And finally, neon is in group 18, and atoms of neon have eight valence electrons. Out of these five elements, the element whose atoms have the fewest valence electrons in their ground state is boron. To reassure yourself, we can go to the periodic table and get the atomic number for each element.
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In general, the number of valence electrons is the same within a column and increases from left to right within a row. Group 1 elements have just one valence electron and group 18 elements have eight, except for helium, which has only two electrons total.
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Group 16 elements with six valence electrons are almost as reactive for the same reason. Atoms of group 18 elements have eight valence electrons (or two in the case of helium).
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Oxygen has six electrons in its outer shell, so it has 6 valence electrons. However, the valence of oxygen is 2 because it only has to make 2 covalent bonds, or gain 2 electrons, to achieve stable octet configuration of a noble gas.
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Answer and Explanation: Xenon has eight valence electrons, which are the electrons in its outer shell.
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In its neutral state, Helium has two electrons in orbit about the nucleus. Model of a helium atom's nucleus with two protons and two neutrons. Helium is a relatively inert element, which when in its neutral state is quite unreactive due to a filled outer shell of electrons.
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When bonded with a full octet (such as in methane) carbon has eight valence electrons (two per covalent bond). Each hydrogen atom has two valence electrons.
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Helium is slightly different than the other noble gas elements. It only has two electrons in its outer shell so its valence electron configuration is 1s2. ... The noble gases are happy with their completely filled valence shells. Because of their uber-high stability, the noble gases are relatively unreactive.
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Valence electrons. Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.
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Helium is slightly different than the other noble gas elements. It only has two electrons in its outer shell so its valence electron configuration is 1s2.
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The sulfide ion has 8 valence electrons and the sulfur atom has 6 valence electrons.
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The 4s and 4p electrons can be lost in a chemical reaction, but not the electrons in the filled 3d subshell. Gallium therefore has three valence electrons. Atoms can combine to achieve an octet of valence electrons by sharing electrons.