1Recognize the efforts of some scientists to classify elements.
2Recognize the principles of elements classification in the modern periodic table.
3Determine the location of some elements in the modern periodic table by recognizing their atomic numbers.
4Deduce the atomic numbers of some elements by recognizing their locations in the modern periodic table.
5Estimate the importance of discipline and organisation in our life.
6Estimate scientists efforts in discovering , classifying and investing elements.