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General chemistry
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General chemistry
selenium
Chemistry; General chemistry
A chemical element with atomic number 34, chemical symbol Se, and an atomic mass of 78. 96. It is a nonmetal, whose properties are intermediate between those of adjacent chalcogen elements sulfur and ...
bromine
Chemistry; General chemistry
A chemical element with the symbol Br, an atomic number of 35, and an atomic mass of 79. 904. It is in the halogen element group.
krypton
Chemistry; General chemistry
A chemical element with the symbol Kr and atomic number 36. It is a member of Group 18 and Period 4 elements.
rubidium
Chemistry; General chemistry
A chemical element with the symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group.
strontium
Chemistry; General chemistry
A chemical element with the symbol Sr and the atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically.
niobium
Chemistry; General chemistry
A chemical element with the symbol Nb and atomic number 41. It's a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral.
molybdenum
Chemistry; General chemistry
A Group 6 chemical element with the symbol Mo and atomic number 42. he free element, which is a silvery metal, has the sixth-highest melting point of any element.
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