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Se, symbol for the element selenium selenium , nonmetallic chemical element; symbol Se; at. no. 34; at. wt. 78.96; m.p. 217°C;; b.p. about 685°C;; sp. gr. 4.81 at 20°C;; valence −2, +4, or +6. Selenium is directly below sulfur in Group 16 of the periodic table.
..... Click the link for more information. . SE (1) (Standard Edition) See Java 2.(2) (Single Ended) The traditional type of signaling on the SCSI bus. See SCSI. (3) See systems engineer and service engineer. (4) (Second Edition) See Windows Second Edition. Se (chemistry)
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