In the modern periodic table, arrange the third-row elements $N a, M g, A l$ and $S i$ in the increasing order of their atomic size.

N a > M g > A l > S i

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A l > S i > N a > M g

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S i > A l > M g > N a

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N a > A l > S i > M g

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Solution

The correct option is A $N a > M g > A l > S i$
The increasing order of the atomic size is $N a > M g > A l > S i$ .
In the given period, on moving from left to right, the atomic size decreases.

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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

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. The order of their ionic size is

N a^{+}

M g^{2 +}

A l^{3 +}

and

S i^{4 +}

are isoelectronic, their ionic size will follow the order:

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:

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In the modern periodic table, arrange the third-row elements Na,Mg,Al and Si in the increasing order of their atomic size.

The correct option is A Na>Mg>Al>SiThe increasing order of the atomic size is Na>Mg>Al>Si.In the given period, on moving from left to right, the atomic size decreases.

In the modern periodic table, arrange the third-row elements $N a, M g, A l$ and $S i$ in the increasing order of their atomic size.

The correct option is A $N a > M g > A l > S i$
The increasing order of the atomic size is $N a > M g > A l > S i$ .
In the given period, on moving from left to right, the atomic size decreases.