Answer
The answer can be found in the image below. Helium, denoted as He, has an atomic number of 2, indicating it has two protons and two electrons, along with a mass number of 4, consisting of 2 neutrons (4 Р2 = 2). The electron configuration of a helium atom is represented as ₂He 1s². Being a noble gas, helium belongs to group 18, which includes other noble gases such as neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). These gases exhibit minimal chemical reactivity.
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