![]() ![]() Not only are they very reactive, they are soft and shiny, can easily be cut even with a dull knife and are the most metallic of all known elements. For further dramatic effect, I also placed some potassium into water and astonished everyone with the explosive bluish flames.īecause Group I metals, also known as alkali metals, are very reactive, like the sodium from the rail car or the potassium, they are not found in nature in pure form but only as salts. While on the air I added some sodium to a bit of water in a petri dish and we observed the vicious reaction. A television reporter called me for an explanation of why firefighters were not allowed to use water on the flames bursting from the mangled car. Ionic compound is formed between ……….The news broke that a railroad car, loaded with pure sodium, had just derailed and was spilling its contents. The diagram given below shows the position of elements in a portion of the periodic table.Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.(a) Name the elements which have taken the place of these elements(b) Mention the group and the period of these elements in the Modern Periodic Table.(c) Classify these elements as metals, non-metals or metalloids(d) How many valence electrons are present in each one of them?.Which of the two metals is more reactive: copper or silver?.State the common and chemical names of the compounds formed when plaster of paris is mixed with water.The electronic configuration of two elements A and B are given below:A 2, 6B 2, 8, 1(a) What type of chemical bond is formed between the two atoms of A?(b) What type of chemical bond will be formed between the atoms of A and B?.An element A from group 14 of the periodic table combines with an element B from group 16.(i) What type of chemical bond is formed?(ii) Give the formula of the compound formed.State two physical properties on the basis of which metals can be distinguished from non-metals.State two physical properties on the basis of which metals can be distinguish from non-metals. ![]() (a) On which side of the periodic table will you find metals?(b) On which side of the periodic table will you find non-metals? (c) What is the name of those elements which divide metals and non-metals in the periodic table?.State any five physical properties of metals and five physical properties of non-metals.Draw electron-dot structure of the product and also state the nature of the bond formed between both the elements. Write the Molecular formula of the compound formed when element. Write the electronic configuration two elements X and Y whose atomic numbers are 20 and 17 respectively.An element X from group 2 reacts with element Y from group 16 of the periodic table.(a) What is the formula of the compound formed?(b) What is the nature of bond in the compound formed?.Explain the difference between the physical and chemical properties of metals and non-metals with the help of a table.Write an example of a compound formed with(a) chlorine (Group 17 of Periodic Table)(b) oxygen (Group 16 of Periodic Table) Carbon, Group (14) element in the Periodic Table, is known to form compounds with many elements.With which name is the bond formed between these elements known and what is the class of the compound so formed known? State any four physical properties of such compounds. Explain by drawing electronic structure how either one of the two metals reacts with a halogen. Write the name and symbols of two most reactive metals belonging to group I of the periodic table. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |