Write the electronic configuration of the following elements.

Na, Mg, Al, and Si.

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Solution

Na = 2,8,1

Mg = 2,8,2

Al = 2,8,3

Si = 2,8,4

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Write the electronic configuration of the following elements.

Na, Mg, Al, and Si.

Question 17
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

Q. The first ionisation energies of six

3^{r d}

period elements are 496, 578, 738, 789, 1000 and 1012

{kJ mol}^{- 1}

. The elements to which these energies correspond respectively are:

The first ionistation enthalpies of Na, Mg, Al, and Si are in the order
(a) Na< Mg > Al < Si (b) Na> Mg > Al > Si
(c) Na< Mg< Al< Si (d) Na> Mg> Al < Si

N a^{+}

M g^{2 +}

A l^{3 +}

and

S i^{4 +}

are isoelectronic, their ionic size will follow the order:

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Write the electronic configuration of the following elements. Na, Mg, Al, and Si.

Na = 2,8,1 Mg = 2,8,2 Al = 2,8,3 Si = 2,8,4

Write the electronic configuration of the following elements.

Na, Mg, Al, and Si.

Na = 2,8,1

Mg = 2,8,2

Al = 2,8,3

Si = 2,8,4