Which of the given elements A, B, C, D and E with atomic number 2,3,7,10 and 30 respectively, belong to the same period?A, B, CB, C, DA, D, EB, D, E
Question
Which of the given elements A, B, C, D and E with atomic number 2,3,7,10 and 30 respectively, belong to the same period?A, B, CB, C, DA, D, EB, D, E
Solution
To answer this question, we need to understand the concept of periods in the periodic table. The period number of an element signifies the highest energy level an electron in that element possesses (in its ground state).
Here are the elements with their corresponding atomic numbers and periods:
- Element A: Atomic number 2 (Helium), belongs to period 1.
- Element B: Atomic number 3 (Lithium), belongs to period 2.
- Element C: Atomic number 7 (Nitrogen), belongs to period 2.
- Element D: Atomic number 10 (Neon), belongs to period 2.
- Element E: Atomic number 30 (Zinc), belongs to period 4.
From the above, we can see that elements B, C, and D (Lithium, Nitrogen, and Neon) all belong to the same period (period 2). Therefore, the correct answer is B, C, D.
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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)
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