The period of the following iso-electronic ions/species ${N a}^{+}, {M g}^{2 +}, {A l}^{3 +}$ is 3. If true enter 1, else enter 0.

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Solution

It is atomic number and not the number and not the number of electrons that decide position in the periodic table.
(a)
Ions/species
group
period
Block
Na+
1(IA)
3
2
Mg2+
2(IIA)
3
s
AI3+
13(IIA)
3
p
(b)
O2 16(VIA)
2
p
,Na+
1 (IIA)
3
s
Ne 18(VIIA)
2
p
(c)
Fe2+ 8(VIIIB)
4
d
Mn+
7(VIIB)
4
d
Cr
6(VIB)
4
d

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{N a}^{+}, {C a}^{2 +}, {M g}^{2 +}, {A l}^{3 +}

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