Question

Answer this question ​

Answer 1

Answer:

a)Al-}3+,Na-}+1,Mg-}2+

b)Na(Along the period atomic radius decrease)

c)Sodium (Na) has the maximum chemical reactivity. Reactivity decreases on moving from left to right in a period.

Answer 2

$\huge\star{\red{\underline{\mathfrak{Answer}}}}$

(a) Aluminium has the highest valency.

Reason :- The valency across a period in the modern periodic table firstly increases and then decreases.

(b) Sodium has the largest atomic radius.

Reason :- The atomic size of the atomic radius across a period decreases from left to right because as the number of electrons increase the protons also increase does increasing the nuclear force.

(c) Sodium will be the most reactive among the three.

Reason :- Sodium has only one electron in its valence shell. Therefore, it is more reactive that means very eager to give its one electron to any other element to get stable configuration.

Extra information :-

The atomic number of sodium is 11.

The atomic number of magnesium is 12.

The atomic number of Aluminium is 13.

The electronic configuration of sodium is (2,8,1).

The electronic configuration of magnesium is (2,8,2).

The electronic configuration of Aluminium is (2,8,3).

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