{"id":1254,"date":"2020-11-30T07:01:06","date_gmt":"2020-11-30T01:31:06","guid":{"rendered":"https:\/\/www.aplustopper.com\/?p=1254"},"modified":"2020-11-30T12:08:24","modified_gmt":"2020-11-30T06:38:24","slug":"modern-periodic-table-significance","status":"publish","type":"post","link":"https:\/\/www.aplustopper.com\/modern-periodic-table-significance\/","title":{"rendered":"Modern Periodic Table and Its Significance"},"content":{"rendered":"

Modern Periodic Table and Its Significance<\/span><\/strong><\/h2>\n

Modern Periodic Table : <\/strong><\/span>
\nHenry Moseley, an English physicist found that the atomic number (Z) was the fundamental property of an elements and not the atomic mass for classification of elements.
\nModern Periodic Law :<\/strong><\/span>
\n\u2018\u2018Properties of elements are periodic functions of their atomic numbers, i.e., the number of protons or electrons present in the neutral atom of an element.\u2019\u2019
\nLong form of Periodic Table :<\/strong><\/span>
\nArranged in increasing order of their atomic numbers.
\nThe prediction of properties elements and their compounds can be made with precision. All drawbacks of Mendeleev’s Periodic Table vanish when the elements are arranged on the basis of increasing atomic numbers.
\nElements in a Group :<\/strong><\/span>
\n(1)\u00a0 They show similar chemical properties due to similar outer electronic configuration, i.e., same number of valence electrons.
\n(2)\u00a0 They have gradation in properties due to gradually varying attraction of the nucleus and the outer valence electrons as we go down the group.
\nMain<\/strong> Features of the Long Form of the Periodic Table :<\/strong><\/span>
\n(1)\u00a0 It shows arrangement of elements based on modern periodic law.
\n(2)\u00a0 There are 18 vertical columns known as groups.
\n(3)\u00a0 There are 7 horizontal rows known as periods.
\n(4)\u00a0 Elements having similar outer electronic configurations, i.e., having same valence electrons have been placed in same groups, e.g.,<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Group-1<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\nK<\/td>\nL<\/td>\nM<\/td>\nN<\/td>\nO<\/td>\nP<\/td>\nQ<\/td>\n<\/tr>\n
H<\/td>\n(1)<\/td>\n1<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Li<\/td>\n(3)<\/td>\n2,<\/td>\n1<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Na<\/td>\n(11)<\/td>\n2,<\/td>\n8,<\/td>\n1<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
K<\/td>\n(19)<\/td>\n2,<\/td>\n8,<\/td>\n8,<\/td>\n1<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Rb<\/td>\n(37)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n8,<\/td>\n1<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Cs<\/td>\n(55)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n18,<\/td>\n8,<\/td>\n1<\/td>\n<\/td>\n<\/tr>\n
Fr<\/td>\n(87)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n32,<\/td>\n18,<\/td>\n8,<\/td>\n1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n
Group-2<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\nK<\/td>\nL<\/td>\nM<\/td>\nN<\/td>\nO<\/td>\nP<\/td>\nQ<\/td>\n<\/tr>\n
Be<\/td>\n(4)<\/td>\n2<\/td>\n2<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Mg<\/td>\n(12)<\/td>\n2,<\/td>\n8,<\/td>\n2<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Ca<\/td>\n(20)<\/td>\n2,<\/td>\n8,<\/td>\n8,<\/td>\n2<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Sr<\/td>\n(38)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n8,<\/td>\n2<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Ba<\/td>\n(56)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n18,<\/td>\n8,<\/td>\n2<\/td>\n<\/td>\n<\/tr>\n
Ra<\/td>\n(88)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n32,<\/td>\n18,<\/td>\n8,<\/td>\n2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Group-13<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\nK<\/td>\nL<\/td>\nM<\/td>\nN<\/td>\nO<\/td>\nP<\/td>\n<\/tr>\n
B<\/td>\n(5)<\/td>\n2<\/td>\n3<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Al<\/td>\n(13)<\/td>\n2,<\/td>\n8,<\/td>\n3<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Ga<\/td>\n(31)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n3<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
In<\/td>\n(49)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n18,<\/td>\n3<\/td>\n<\/td>\n<\/tr>\n
Tl<\/td>\n(81)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n32,<\/td>\n18,<\/td>\n3<\/td>\n<\/tr>\n
Group-14<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\nK<\/td>\nL<\/td>\nM<\/td>\nN<\/td>\nO<\/td>\nP<\/td>\n<\/tr>\n
C<\/td>\n(6)<\/td>\n2<\/td>\n4<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Si<\/td>\n(14)<\/td>\n2,<\/td>\n8,<\/td>\n4<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Ge<\/td>\n(32)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n4<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Sn<\/td>\n(50)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n18,<\/td>\n4<\/td>\n<\/td>\n<\/tr>\n
Pb<\/td>\n(82)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n32,<\/td>\n18,<\/td>\n4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n
Group-15<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\nK<\/td>\nL<\/td>\nM<\/td>\nN<\/td>\nO<\/td>\nP<\/td>\n<\/tr>\n
N<\/td>\n(7)<\/td>\n2<\/td>\n5<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
P<\/td>\n(15)<\/td>\n2,<\/td>\n8,<\/td>\n5<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
As<\/td>\n(33)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n5<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Sb<\/td>\n(51)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n18,<\/td>\n5<\/td>\n<\/td>\n<\/tr>\n
Bi<\/td>\n(83)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n32,<\/td>\n18,<\/td>\n5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n
Group-16<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\nK<\/td>\nL<\/td>\nM<\/td>\nN<\/td>\nO<\/td>\nP<\/td>\n<\/tr>\n
O<\/td>\n(8)<\/td>\n2<\/td>\n6<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
S<\/td>\n(16)<\/td>\n2,<\/td>\n8,<\/td>\n6<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Se<\/td>\n(34)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n6<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Te<\/td>\n(52)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n18,<\/td>\n6<\/td>\n<\/td>\n<\/tr>\n
Po<\/td>\n(84)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n32,<\/td>\n18,<\/td>\n6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n
Group-17<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\nK<\/td>\nL<\/td>\nM<\/td>\nN<\/td>\nO<\/td>\nP<\/td>\n<\/tr>\n
F<\/td>\n(9)<\/td>\n2<\/td>\n7<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Cl<\/td>\n(17)<\/td>\n2,<\/td>\n8,<\/td>\n7<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Br<\/td>\n(35)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n7<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
I<\/td>\n(53)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n18,<\/td>\n7<\/td>\n<\/td>\n<\/tr>\n
At<\/td>\n(85)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n32,<\/td>\n18,<\/td>\n7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n\n
Group-18<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\nK<\/td>\nL<\/td>\nM<\/td>\nN<\/td>\nO<\/td>\nP<\/td>\n<\/tr>\n
He<\/td>\n(2)<\/td>\n2<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Ne<\/td>\n(10)<\/td>\n2,<\/td>\n8<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Ar<\/td>\n(18)<\/td>\n2,<\/td>\n8,<\/td>\n8<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Kr<\/td>\n(36)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n8<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Xe<\/td>\n(54)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n18,<\/td>\n8<\/td>\n<\/td>\n<\/tr>\n
Rn<\/td>\n(86)<\/td>\n2,<\/td>\n8,<\/td>\n18,<\/td>\n32,<\/td>\n18,<\/td>\n8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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