hydrogen to calcium fourth row elements

It is fifth most abundant element in Earth's crust. It is found existing as whole mountain ranges of limestone, marble and chalk, in vast sedimentary rocks of CaCO 3 . Other important minerals containing calcium are gypsum (CaSO 4 .2H 2 O..

In potassium (Z=19) and calcium (Z=20), electrons enter the 4s-orbitals in accordance with the fact that 4s-orbital is slightly lower in energy than 3d-orbital. With scandium (Z=21), 3d-subshell comes into use and from scandium to zinc, this subshell is gradually fille..

The first row of elements contains only two elements hydrogen and helium. Hydrogen (Z = 1) has only one electron and it goes to 1s orbital. In helium (Z =2) atom, the second electron can also go into 1s orbital. The electrons must have op..

The third row elements are from sodium to argon. The build up of these eight elements proceeds exactly in the same manner as discussed above. Here 3s- and 3p-orbitals are filled in place of 2s- and 2p-orbitals as has been done in case of Li to Ne. ..

Atomic number of potassium is 19 and its electronic configuration is K L M N 1 8 8 1 Atomic number of calcium is 20 and its electronic configuration is K L M N 2 8 8 2 This abnormal behaviour can be explained as follows: It is found that shells have sub shells. The sm..

In lithium (Z =3), the third electron goes to the next 2s orbital. In Beryllium (Z = 4), the fourth electron fills 2s orbital and in boron (Z = 5), the next electron goes to the next available 2p orbital. In carbon, the sixth electron is also to go ..

Calcium hydroxide is obtained as white precipitate when sodium hydroxide is added to a concentrated solution of calcium chloride...

These react with oxygen at room temperature to form respective oxides. These oxides are basic in nature and react with water to give the corresponding alkali. ..

Summary - Hydrogen is the most abundant element in the universe. Hydrogen is also the lightest element in the universe. It has a vapour density of 1, which is 14.4 times lighter than air. Hydrogen is absent in the free state in the earth's..

Certain elements like calcium, magnesium, nitrogen, phosphorus, carbon, hydrogen, oxygen and sulphur are required by plants in large amounts and are called major or macronutrients (atleast 1 mg/g of dry matter). The elements like manganese, boron, copper, zin..