The periodic tableOnline version the learner should be able to understand how elements are positioned in the periodic table by Lilian Onyiego 1 which is the most reactive metal? a copper b Gold c Potassium 2 what do we call the elements in group I of the periodic table? a Halogens b Alkali metals c transition compounds 3 how many energy levels does an element whose atomic number is 15 has? a 5 b 3 c 15 4 in which period of the periodic table does an element with atomic number 15 belong? a 3 b 8 c 15 5 The element with the electronic configuration 2.8.7 belongs to which group of the periodic table? a 2 b 3 c 7 Feedback 1 the reactivity series of metals is K, Na, Ca, Mg, Al, Zn, Fe,Pb, Cu, Hg, Ag, Au 2 The common chemical families are; Group I - alkali metals Group II - alkaline earth metals Group VII - halogens Group VIII - noble gasses 3 the electronic configuration of this element is 2.8.5. The first energy level (inner most) has 2 elctrons, the second has 8 electrons while the third (outer most) energy level has 5 electron 4 an eelement which has three energy level is found in the the 3rd period in the periodic table 5 The group that an element belongs to depends on the number of electrons in its outer most energy level
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