5.Metal p is a group 2 element in the periodic table and it lies below Q in the same group(a) Explain how the reactivity of metal P and Q withbrominecompares (1 mark)....................................................................................................................................................................................................................................................................(b) Given that the atomic number of Q is 12, determine the atomic number of P. Showhow you arrive at youranswer
Question
5.Metal p is a group 2 element in the periodic table and it lies below Q in the same group(a) Explain how the reactivity of metal P and Q withbrominecompares (1 mark)....................................................................................................................................................................................................................................................................(b) Given that the atomic number of Q is 12, determine the atomic number of P. Showhow you arrive at youranswer
Solution
(a) In the periodic table, reactivity of Group 2 elements increases as you move down the group. This is because the outermost electrons are further from the nucleus and are therefore less tightly held. This makes it easier for the atom to lose these electrons in a reaction, increasing its reactivity. Therefore, metal P, which lies below Q in the same group, would be more reactive with bromine than Q.
(b) In the periodic table, each period (horizontal row) represents a new energy level being filled with electrons. Group 2 elements include Beryllium (Be, atomic number 4), Magnesium (Mg, atomic number 12), Calcium (Ca, atomic number 20), Strontium (Sr, atomic number 38), Barium (Ba, atomic number 56), and Radium (Ra, atomic number 88).
Given that the atomic number of Q is 12 (which corresponds to Magnesium), the element P that lies below Q in the same group would be Calcium (Ca) with an atomic number of 20.
This is because the atomic number increases by 8 from Beryllium to Magnesium (4 to 12), and by 8 again from Magnesium to Calcium (12 to 20). Therefore, the atomic number of P is 20.
Similar Questions
10.Give the name of the second least reactive metal in group 1
(a) Study the information in the table below and answer the questions that follow. Theletters do not represent the actual symbols of theelements.Element Atomic number Melting pointofelementFormula ofchlorideMelting pointof chlorideG 11 98 GCI 801H 12 650 HCl 2 715J 14 1410 JCl 4 -70K 16 113 K 4 Cl 2 -80L 20 851 LCl 2 780(i) Which elements are metals? Giveareason (2marks)........................................................................................................................................................................................................................................................................(ii) Write the formula of the compound formed when element H reacts withelement(1 mark)....................................................................................................................................(iii) Explain why the melting point of J is higher than thatof K (2marks)............................................................................................................................................................................................................................................................................................................................................................................................................(iv) What is the oxidation state of J initschloride? (1mark)....................................................................................................................................(v) How doesthe:-Melting point of the fluoride of G compare with that of its chloride?10Explain (2marks)............................................................................................................................................................................................................................................................................................................................................................................................................-Reactivity of H and L with water compare? Giveanexplanation
3.(a) The table below shows the atomic numbers of elements of the periodic table representedby letter J toQ.The letters are not the actual chemical symbols for the elementsElement J K L M N P O QAtomicnumber3 7 8 9 10 12 13 1410(i) Select two elements which belongto:I The same period of theperiodictable (1 mark)..............................................................................................................................................................................................................................................................II The same group of the periodictable.............................................................................................................................................................................................................................................................(ii) Select theelementwhich (1 mark)I Will form a divalentunion....................................................................................................................................................................................................................................................................II Reacts most vigorously withwater.....................................................................................................................................................................................................................................................................(b) The boiling points of some chloride are shown in the tablebelow:Group I II III IV V VI VIIChloride LiCl Chlorideof WBCl 3 CCl 4 NCl 3 OCl 2 FClB.P. ( 0 C) 1350 487 12 77 71 2 -101Chloride Nacl Mgcl 2 AlCl 3 Chlorideof XPCL 3 SCl 2 Cl 2B.P. ( 0 C) 1465 1418 Sublimesat 18057 74 59 -35(i) What is the most likely formulae for the chlorides of W andX?...................................................................................................................................................................................................................................................................(ii) Select two chlorides from the table which are the most ionic. Explain why the twoelected chloride are the mostionic.......................................................................................................................................................................................................................................................................(iii) Would you expect group VIII elements of the periodic table to form chlorides?Explaintheanswer (1mark)
13. Group 1 elements are called ________________________ and will react with Group 17 elements, which are called __________________ to create _____________.14. Metalloids are used for ______________________.15. Metals are typically found in Groups _____ to _____ on the Periodic Table.16. The lower block transition elements are called the ________________ and the ___________________.Chapter 11 Review Questions1.An outermost electron of an atom that participates in chemical bonding. _____________________________2. The attraction between positively and negatively charged ions in an ionic compound. ________________________3. A group of atoms held together by covalent bonding that acts as an independent unit. _________________________4. A molecule that has a partial positive and a partial negative end because of unequal sharing of electrons. ___________________5. Electrons closest to the nucleus have the ____________ energy.6. The number of paired dots in the electron dot diagram tell you ___________________________________.7. Elements form bonds to __________________________________.8. Covalent bonding occurs between _____________________________.9. Ionic bonding occurs between __________________________________.10. Elements with _____ valence electrons are the most stable.11. The most stable element is Group 18, or the __________________________.
2.To place metals in order of their reactivity, metals are reacted with water or _____ ___ and see which metals react the most/least
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