NHÓM IVA
Cacbon
Silic
Thiết
Chì
Bài 1
Nguyên tử X (Z= 14). Viết cấu hình electron nguyên tử của , từ đó xác định vị trí của nó trong bảng tuần hoàn.
Bài 2.
Viết công thức electron và công thức cấu tạo của CO và CO2 và CH4. Từ đó cho biết số oxi hóa của C trong các hợp chất đó.
Bài 3
Các nguyên tố thuộc nhóm IVA nguyên tố nào là kim loại, nguyên tố nào là phi kim ? So sánh tính kim loại và tính phi kim. Giải thích.
Bài 4.
So sánh tính phi kim C và N. Giải thích ?
Bài 5.
So sánh độ bền nhiệt của
Nhóm VIIA: HCl và HI
Nhóm VIA: H2O và H2S
Nhóm VA: NH3 và PH3
Nhóm IVA: CH4 và SH4
Nhận xét.
Carbon is a nonmetallic chemical element in Group IVa of the periodic table. In 1961 the isotope carbon-12 was selected to replace oxygen as the standard relative to which the atomic weights of all the other elements are measured; carbon-14, which is radioactive, is the isotope used in radiocarbon dating and radiolabeling.
Si is a nonmetallic chemical element in the carbon family (Group IVa of the periodic table). Silicon makes up 27.7 percent of the Earth`s crust; it is the second most abundant element in the crust, being surpassed only by oxygen.


Silicon was first isolated and described as an element in 1824 by Jöns Jacob Berzelius, a Swedish chemist. Silicon does not occur uncombined in nature; but it is found in rocks. Its compounds also occur in all natural waters, in the atmosphere (as siliceous dust), in many plants, and in the skeletons, tissues, and body fluids of some animals.

e), a chemical element between silicon and tin in Group IVa of the periodic table, a silvery-gray metalloid, intermediate in properties between the metals and the nonmetals.
Many other substances now also are used as semiconductors, but germanium remains of primary importance in the manufacture of transistors and of components for devices such as rectifiers and photocells.
Tin is a chemical element belonging to the carbon family, Group IVa of the periodic table. It is a soft, silvery-white metal with a bluish tinge, known to the ancients in bronze, an alloy with copper. Tin is widely used for plating steel cans used as food containers, in metals used for bearings, and in solder.
Lead is a soft, silvery-white or grayish metal in Group IVa of the periodic table. Lead is very malleable, ductile, and dense and is a poor conductor of electricity. Known in antiquity and believed by the alchemists to be the oldest of metals, lead is highly durable and resistant to corrosion, as is indicated by the continuing use of lead water pipes installed by the ancient Romans.