Question

PERIODIC TABLE REVIEW WORKSHEET 1. Match the man with his contribution to (A) Lothar Meyer with his contribution to the Periodic Table: Doberiner (A) groups of 3.elements, called triads (C) Dmitri Mendelevey (8) graphed atomic weight Vs atomic volune.meyer nendeleyev (c) properties repost every oth element-Newlanas (C) proper (E) Henry Moseley (D) used X-rays to define "atomic numbers'-moseley (E) "periodic law" based on atomic weights-menckeleen 2. Identify an A periodic tables (A) period (D) transition metal (G) inert gas (Group 18 ) (B) family or group (E) alkaline earth (H) rare earth (C) metalloids (F) alkali metal/ (I) halogen . 3. Which element is more active and WHY? (A) Oxygen or sulfur E calcium or barium 4. In what period and what group does selenius (At. No. 34) belong periodu, Group 16 5. In general, in the main groups where are the elements which are (A) more metallic (D) less metallic (B) more non-metallic (E) less non-metallic (C) most active metals (F) most active non-metals 6. Give the electron dot structures for the first ten elements. 7. An atom with outermost electron in the fourth energy level is in what period? hamn 8. Which elements tend to gain electrons? Lose electrons? 9. What element does not clearly fit one place on the periodic table? 10. What family would include a neutral atom having 2 electrons in its outer most energy level? 11. What atomic structure makes one period different from another? 12. What atomic structure makes one family different from another? 13. How was Mendeleyev able to predict the properties of the elements that were missing from his periodic table? 14. Define "Ionization Energy." Why is it important? 15. Why is it harder to remove one electron from calcium than from potassium? Why is it harder to remove the SECOND electron from potassium than from calcium?

Answer 1

(a) Lother Meyer - (0) Craphed atomie Coghl *FOC Vs atomic Volume (6) Johann Döbereiner – (A) Grouped 3 element, called triards CC) Dimitri Mendeleyev - Ce) " periodic law." & Appon based on atomie creights (0) John Newlands - (c) Properties crepent (E) Henny Moseley - (B) wed to many to number @ Amower to this question is given in typed format - below. Onggon is more reactive than sulfan. This is because Onggen is small and more electronegative than sulfur. Barrium is more reactive than calcium. This is because Barrium is larger im sire (B)

and than have more electropositive character Calcium. Selenium belongs to period 4 and group 16. ( 21) 6 (A) Mor metalic - To the left of the Periodic table (group ! and 2). Doon the group metalic character increases. (B) More non metallic - To the top right of Periodic table (Groups (Age : 17 and 18) (c) Most active metals - Group I (0) less metallic - Group a elements are less metallic than Group 2 Along the period, metalic character derforeeses. (6) less non metalic Group 1 Group a the are non metalic. Down a penod, non- metalic character obecreases, decreases.

F) Most active nom-metais - Group iz elements. CF, Cl, Br, I etc) bo yotrogen – Helium in Lithiume 4 the wo Bei Cist (152) (15² 25). (159252) 12: 10 t Beryllium ot Boron Carbon Nitragen Onggen atenor Fluorine B. i. V 0 (is? 25 apl) (152 252 2p?) (15225283 ) (15? 25 apt) (15225²2p5 ) - – Neon - Ne: (18925?2p6)

(7) 4th period 15 startet * Elements that require electrons to complete their ochet in order to attain stability erill have the tendency to gain electron (They will be more electronegative) & Elements which can attain a closed shell have tendency to lose electrodom. electron will con configuration by donating © Hydrogen - It have properties that is similar to both alkali metals as well as barn of 20 gen halogens. Horni (10) Alkalime earth metails. ( Group 2) One period differ from other by the presence of energy devels. For example est period elements have only energy level 1 (k-shen) while second period in addition, to energy level 1 also posses an energy level a Cl-shell)

(2) Mendelevte left gaps in his period i'e falde to place elements not known at the time. By looking at the chemical properties and physical Properties of the elements next to a gap, he could also predict the properties of these undiscovered elements. pintomolo per non (13) Toniration energy is the auantity of energy that an isolated, gaseous atorm in the ground state must absorb to discharge an electrom, resulting in a cation Tonirahom energy help us to understand the amount of energy that must be supplied to an atom for ionizing it. (15) Pottasium (k) hive electronic configuratom CAv] 4s so it can remove the outer shell electrom easily to achieve noble you configuration and hence stability. Kis more electeropositive in nature and

However Ca is smaller in stre compared to k and also have increased nuclear charge. Thus nucleous of Ca holds its outer shell electrons mome strongly than k. Thas it is difficult to remove electron from Ca. Farther electronic Configuration of Ca is CAN] 4s2 is; it have paired electrons im unter shell . This pack also adds the difficulty. 15) Electronic configuration of pottasium CK) is (Ar]4s'. chen one electrom is cremoved it attains noble gas configuration, which is highly stable. Removal of another electron from the noble gas configuration is highly difficult, as this configuration is Very much stabilired.