ธาตุ se เลข มวล Atomic number, 34, Relative atomic mass, 78.971 ; State at 20°C, Solid, Key isotopes · Se ; Electron configuration, [Ar] 3d104s24p · CAS number, 7782-49-2.

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Name Selenium Symbol Se Atomic Number 34 Atomic Mass 78 96 amu Melting Point 217 0 C 490 15 K 422 6 F Atomic number 34 Relative atomic mass 78 971 State at 20 C Solid Key isotopes Se Electron configuration Ar 3d104s24p CAS number 7782 49 2 เลขอะตอม 34 มวลอะตอม 78 96 Mass Number 79 ประเภท อโลหะ สี สีเทา Se 76Se 77Se 78Se 80Se ไอโซโทปที่ไม่เสถียร 65Se 66Se 67Se 68Se 69Se  ซีลีเนียม คุณสมบัติทั่วไป เลขอะตอม 34 มวลอะตอม 78 96 คุณสมบัติกายภาพ สถานะ แข็ง ความหนาแน่น 4 809 g cm คุณสมบัติอะตอม รัศมีอะตอม 120 pm รัศมีโควาเลนต์ 120 pm Atomic number 34 Relative atomic mass 78 971 State at 20 C Solid Key isotopes Se Electron configuration Ar 3d104s24p CAS number 7782 49 2

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4.9 out of 5 stars
525753 global ratings

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  • master_8581
    5.0 out of 5 starsVerified Purchase
    ซีลีเนียม - Disthai
    Reviewed in the Thailand on July 6, 2025
    In 1934, the Commission recommended Ar(Se) = 78.96 based on the chemical determinations. This value was reaffirmed in 1969 when Ar(Se) = 78.96(3) was ...
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  • user7192
    1.0 out of 5 starsVerified Purchase
    ซีลีเนียม – ธาตุเคมีจากตารางธาตุ - Periodic Table
    Reviewed in the Thailand on July 17, 2025
    Name: Selenium ; Symbol: Se ; Atomic Number: 34 ; Atomic Mass: 78.96 amu ; Melting Point: 217.0 °C (490.15 K, 422.6 °F)
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  • winner1765
    1.0 out of 5 stars
    ซีลีเนียม
    Reviewed in the Thailand on June 25, 2025
    ชื่อ, สัญลักษณ์, เลขอะตอม, ซีลีเนียม, Se, 34. G. อนุกรมเคมี · แชลโคเจน · หมู่, คาบ, บล็อก · 16, 4, p · ลักษณะ, gray, metallic luster. มวลอะตอม · 78.96 (3) กรัม/โมล. การจัด ...
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