Question

fill in the blanks with the correct word in brackets: i) If an element 6 electrons in its outermost L shell it's valency is___________(+2,-2,+1,-1). ii) Thermal______________(decomposition,dissociation) is a reversible reaction. iii)The formula of aluminum sulphide is (AIS, Al3S2,Al2S3) iv)Direct combination of reaction of sulphur dioxide with water gives____________(H2SO4,H2SO3,H2S2O7). v) A trivalent metal is______________(Aluminum,Sodium,Magnesium).


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Answer 1

Answer:

(i) The amount of energy required to remove a loosely bound electron from its outermost shell is known as ionization energy. Ionization energy increases as we go from left to right in a period as the atomic radii decreases. Hence, metals lose electron easily an have low ionization energy.

(ii)As we go from left to right in a period as the atomic radii decreases as the electrons are added to the same valence shell. The nuclear attraction decreases and hence the element shrinks. Hence, element with 7 electrons in its valence shell will have smallest atomic size.

Answer 2

Answer:

1) -2

2) decomposition

3) Al²S³

4) H²SO³

5) magnesium

Explanation:

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