Only H,He,LI,Be,B,C,N,O,F,Ne has no d orbital.And all other elements of periodic table has their individual d orbitals>THis is right na?

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Solution

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Q. According to the location in periodic table which statement(s) regarding the first ionization energies of specific elements should be true?
I.

L i

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N a .

II.

K

has a higher value than

C s .

III.

N a

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A l

Q. Statement 1: An element that has the electron configuration

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2}

is a transition element.

Statement 2: In the periodic table atoms of transition elements 1s, 2s, 2p, 3s,and 3p orbitals are completely filled in the ground state.

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(n + l)

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Using a part of the periodic table given below answer the following questions:
(i) Na has physical properties similar to which elements and why?
(ii) Write the electronic configuration of N and P.
(iii) State one property common to fluorine and chlorine.

$\begin{matrix} G r o u p P e r i o d & I & I I & I I I & I V & V & V I & V I I & Z e r o 1 & H & H e 2 & L i & B e & B & C & N & O & F & N e 3 & N a & M g & A l & S i & P & S & C l & A r 4 & K & C a \end{matrix}$

Q. (a) Explain why, the first period of the modern periodic table has only two elements whereas second period has eight elements
(b) Why do elements in the same group show similar properties but the elements in different groups show different properties?
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Elements	Least atomic radius	Chemically least reactive
(i) F, Cl, Br (ii) Li, Na, K	.................... ....................	.................... ....................

(d) State one reason for keeping fluorine and chlorine in the same group of the periodic table.
(e) What are the merits of the modern periodic table of elements?

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