helium
TRANSCRIPT
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Helium (He) adalah unsur kimia yang tak berwarna, tak berbau, tak berasa, tak beracun, hampir inert, monatomik, dan merupakan unsur pertama pada seri gas mulia dalam tabel periodik dan memiliki nomor atom 2.
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Keterangan Umum Unsur
Nama, Lambang, Nomor
atomhelium, He, 2
Deret kimia gas mulia
Golongan, Periode, Blok 1, 1, s
Penampilan
Massa atom 4,002602(2) g/mol
Konfigurasi elektron 1s2
Jumlah elektron tiap
kulit2
Titik leleh -272 o C @ 26atm
Titik didih -268.6 o C
Digunakan : Balon udara, ballons, dll.
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