2 CONTENTS 1] … GENERAL OBJECTIVE. 2] … SPECIFIC OBJECTIVE. 3] … P.K. TESTING.4] … ANNOUNCEMENT OF TOPIC.5] … MOTIVATION.6] … PRESENTATION.7] … GROUP ACTIVITY.8] … EVALUATION.9] … HOME ASSIGNMENT.
3 GENERAL OBJECTIVES1. To develop the interest and scientific attitude among the students.2 To develope the abilities likesensing the problemorganise and interpretanalyse and generalizediscuss and argue3. To develop critical attitude
4 SPECIFIC OBJECTIVES At the completion of the lesson the students must be able to explain the importance of Classification of elements.The student must be able to explain about why elements have been classified.The student must be able to explain the basis on which elements have been classified.The student must be able to identify the blocks.The student must be able to locate an element in a particular Block, group, and period.The students would be able to draw periodic table7
5 PREVIOUS KNOWLEDGE TESTING Why similar things are placed together in a shop?
6 SeeH2ONaClCO2,N2,O2AuIdentify above pictures as elements , Compounds or Mixtures ?
7 Au Why Gold, Silver & Iron are called elements? Are there only three elements ?If no then give some other examples ?There are so many ELEMENTS, approximately 118 elements are known till date.
8 As the students are arranged in morning assembly Can the elements be ?
9 ANNOUCEMENT OF THE TOPIC Dear students Today we shall have a discussion on the topicMODERN PERIODIC TABLE
10 MOTIVATIONDear students, As in the morning assembly students assemble according to their classes and genders so that any student may be located easily . Similarly 118 known elements are classified into different blocks in the increasing order of atomic numbers. This helps us to locate them & remember their properties.
12 Periodic Table Modern Periodic Law What is Atomic number? The number of Protons in an atom orthe number of electrons in a neutral atomModern Periodic LawThe properties of elements are directly related to their atomic numbers & therefore the elements are arranged in the increasing order of their atomic numbers in a tabular form.What is tabular form?Periodic TableWhat is the basis of arrangement of elements in the periodic table?Atomic number
13 Why elements are arranged in increasing order of atomic numbers? Because when elements are arranged in increasing order of atomic numbers their properties repeat after regular intervalsWhy do properties of elements repeat after regular intervals?Because of the repetition of the same number of electrons in the outermost shell after regular interval.Hence we can also say that properties depend upon the number of electrons in the outer most shell.
14 Broadly according to the arrangement of electrons in the outer most shell the elements have been divided into four blocks namely:s blockp Blockd Blockf block
17 S Block Elements Remembering Aid:Bemg casr bara The Group I elements except Hydrogen are collectively calledAlkali Metals.Remembering Aid:Hi liNa ki Rub ce friendshipand The Group II elements are collectively called Alkaline earthMetals.Remembering Aid:Bemg casr bara
18 p Block elements Group17elements are called Halogens The p Block elements along with s Block elements are calledRepresentative elements.Group17elements are calledHalogensThose of 18 are called Noble gases and those of 16 are called Chalcogens
19 d Block elements All Metals except Mercury are solids at room temp. The elements of d Block are generally called Transition MetalsAll Metals except Mercury are solids at room temp.Mercury is liquid .The metals like Silver, Copper & Gold are used in making coins so they are called COINAGE METALS
20 f Block ElementsThe f Block elements are called Inner Transition ElementsThe elements after Uranium are calledTransuranic ElementsMost of them are Radioactive & therefore used as Nuclear fuels.
21 Assignments to various groups: Group 1.(s-BLOCK)Why are elements of group I called alkali metel?Why are elements of group II called alkaline earth metel?Where do sodium and magnesium elements exist in periodic table?Group 2.(p-BLOCK)Why are elements of group 16 called chalcogens?Why are elements of group 17 called halogens?Where do oxygen and nitrogen elements exist in periodic table?Group 3.(d-BLOCK)Which elements of d block are not called transition elements and why?Why are d block elements called transition elements?Where do iron and mercury elements exist in periodic table?Group 4.(f-BLOCK)Why are f block elements called inner transition elements?Which element of f block is used as nuclear fuel?Where do the elements of f block lie in periodic table?
22 EVALUATION What is the importance of Classification of elements? Why elements have been classified?Explain the basis on which elements have been classified.How many blocks are there in periodic table give their names?Locate phosphorous and sodium in p and s blocks respectively.
23 Home assignments: Make a labeled sketch of modern Periodic Table Suggest some alternative ways to arrange elements.What defects do you see in the periodic table?
25 suggessionsYou are requested to insert your effects from different sources to make the lesson plan more interesting if you think so because it is not ultimate.Students are encouraged to corelate the knowledge with surrounding and in day today life.