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Helium (from Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table.
Helium is the 2nd element in the periodic table and has a symbol of He and atomic number of 2. It has an atomic weight of 4.00260 and a mass number of 4. Helium has two protons and two neutrons in its nucleus, and two electrons in one shell.
Element Helium (He), Group 18, Atomic Number 2, s-block, Mass 4.003. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Helium is a chemical element with symbol He and atomic number 2. Classified as a noble gas, Helium is a gas at room temperature.
9 Απρ 2020 · With the periodic table symbol He, atomic number 2, atomic mass of 4.00260 g.mol-1, and electron configuration 1s2, helium is a colorless, odorless, tasteless, and non-combustible noble gas. It reaches its boiling point at −268.928°C, −452.07°F, 4.222 K, while the melting point is achieved at −272.20°C, −457.96°F, 0.95 K.
2 Σεπ 2021 · Helium is atomic number 2 on the periodic table, with the element symbol He. It is a colorless, flavorless gas, best known for its use in filling floating balloons. Here is a collection of facts about this lightweight, interesting element: Helium Element Facts. Helium Atomic Number: 2. Helium Symbol: He. Helium Atomic Weight: 4.002602 (2)
Name: Helium. Symbol: He. Atomic Number: 2. Atomic Mass: 4.002602 amu. Melting Point: -272.0 °C (1.15 K, -457.6 °F) Boiling Point: -268.6 °C (4.549994 K, -451.48 °F) Number of Protons/Electrons: 2. Number of Neutrons: 2. Classification: Noble Gas. Crystal Structure: Hexagonal. Density @ 293 K: 0.1785 g/cm 3. Color: colorless. Atomic Structure.
