element

phosphorus and mercury

Phosphorus (pronounced /ˈfɒsfərəs/, FOS-fər-əs) is the chemical element that has the symbol P and atomic number 15. A multivalent nonmetal of the nitrogen group, phosphorus is commonly found in inorganic phosphate rocks. Elemental phosphorus exists in two major forms – white phosphorus and red phosphorus. Although the term "phosphorescence", meaning glow after illumination, derives from phosphorus, glow of phosphorus originates from oxidation of the white (but not red) phosphorus and should be called chemiluminescence.Due to its high reactivity, phosphorus is never found as a free element in nature on Earth. The first form of phosphorus to be discovered (white phosphorus, in 1669) emits a faint glow upon exposure to oxygen – hence its name given from Greek mythology, Φωσφόρος meaning "light-bearer" (Latin Lucifer), referring to the "Morning Star", the planet Venus..



Mercury, also known as quicksilver or hydrargyrum, is a chemical element with the symbol Hg (Latinized Greek: hydrargyrum, from "hydr-" meaning watery or runny and "argyros" meaning silver) and atomic number 80. A heavy, silvery d-block metal, mercury is one of only two liquid elements at conventional room temperature, the other being bromine. It is also one of the five metallic chemical elements that are liquid at or near room temperature and pressure,[1][2] the others being caesium, francium, gallium, and rubidium. Mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine.[3] With a melting point of −38.83 °C and boiling point of 356.73 °C, mercury has one of the broadest ranges of its liquid state of any metal.mercury


圖片參考：http://upload.wikimedia.org/wikipedia/commons/thumb/9/99/Pouring_liquid_mercury_bionerd.jpg/250px-Pouring_liquid_mercury_bionerd.jpg

phophorus

圖片參考：http://upload.wikimedia.org/wikipedia/commons/thumb/8/88/PhosphComby.jpg/250px-PhosphComby.jpg


2010-09-09 16:57:01 補充：
the others are called compounds

2010-09-10 15:23:52 補充：
係維基揾啲嘢參考吓啫

答你就答啦, 響維基抄一大段野做咩? 又冇做reference, 上大學時因住俾人捉plagiarism 剽竊, 書都冇得你讀呀!

返正題. element (元素) 意思是kind of atoms with same number of protons in their nuclei. phosphorus (磷, P) & mercury (汞/水銀, Hg) are elements. P has 15 protons while Hg has 80 protons.

compound (化合物) 意思係 substances formed by combination of two or more elements.
sodium chloride (NaCl, 氯化鈉, 食用鹽) -- formed by sodium (Na, 鈉) and chlorine (Cl, 氯);
ammonia (NH3, 氨) -- formed by nitrogen (N, 氮)and hydrogen (H, 氫);
glucose (C6H12O6, 葡萄糖) -- as a carbohydrate (碳水化合物), formed by carbon(C, 碳), hydrogen and oxygen;
sulphuric acid / sulfuric acid (H2SO4, 硫酸)-- sulphur / sulfur (S, 硫), hydrogen and oxygen.


2010-09-12 15:54:21 補充：
咁抄兩句就夠啦
一係貼條link 出黎亦比較合理