The energy of the electrons in a sublevel would then be lower with half-filled Helium falls under inert gas since its outermost electron orbital is full of two electrons. Create your account. Helium (He), chemical element, Group 18 inert gas (noble gases) of the periodic table. Helium is the element which you can find on the upper right side of the periodic table with. This order is difficult to remember and often hard to determine from energy-level diagrams such as Figure 5.8. Helium, the lightest of the noble gases, had actually been detected and helium is the only element in the periodic table that was discovered by an astronomer. their axes.) Potential changes from to … Services, Working Scholars® Bringing Tuition-Free College to the Community. What are the corresponding energies? What … The element lithium (atomic number 3) has three electrons. What type of element is helium? Section 5.3B that two electrons in an orbital spin in opposite directions on A core-abbreviated electron configuration (right) replaces the core electrons with the noble gas symbol whose configuration matches the core electron configuration of the other element. The electron configuration of boron is: Table 5.2 shows the electron configurations of the elements with atomic numbers 1 through 18. Scientists knew there is an enormous amount of helium in the Sun before it was discovered. (Recall from Determine the ratio of neutrons and protons in the... What color does helium burn? These ions have the same stable electron configuration as the noble gas helium. The direction of the arrow represents the spin of the electron. Helium gas can be used to treat conditions like asthma and emphysema for respiratory ailments. Since it has the ability to diffuse through solids much faster than air, helium is used industrially for pipeline leak detection. 2. If an atom doesn't have a filled shell, it will be chemically active. In order to write its electron configuration, we must first determine (from Figure 5.9) that the 2s sublevel is next higher in energy after the 1s sublevel. It holds the lowest boiling and melting points amongst the all other elements. 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