3 bc Hf is an element hafnium and HF is compound hydrogen flouride
Answer:
The valency of Aluminium (Al) is +3 whereas, the valency of Chlorine is -1.
Explanation:
Valency is not defined for a compound. It is only for elements. Basically, valency is the combining or replacing power of an hydrogen atom of a certain element with an other atom of element.
Cs and F
Explanation:
The two elements on the periodic table that would be most reactive would be Cesium and Florine.
Florine is the most electronegative and the most reactive non-metal on the periodic table. It has a small size and needs just one electron to complete its octet.
Cesium is the most electropositive non-metal. It requires just a loss of one electron to be stable and have complete octet.
Cs and F are the most electropositive and elecronegative elements on the periodic table of elements.
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Answer:
pH = 12.6
Explanation:
The HF reacts with LiOH as follows:
HF + LiOH → LiF + H₂O
To solve this question we need to find the moles of each reactant:
<em>Moles HF:</em>
0.1500L * (0.20mol / L) = 0.030 moles HF
<em>Moles LiOH:</em>
0.600L * (0.10mol / L) = 0.060 moles LiOH
That means there is an amount of LiOH in excess, that is:
0.060 mol - 0.030 mol = 0.030 moles LiOH
In 600.0mL + 150.0mL = 750.0mL = 0.750L
The molarity of LiOH is:
0.030 moles LiOH / 0.750L =
0.040M LiOH = [OH⁻]
As:
Kw = 1x10⁻¹⁴ = [H⁺] [OH⁻]
1x10⁻¹⁴ = [H⁺] [0.040M]
2.5x10⁻¹³M = [H⁺]
As pH = -log [H⁺]
<h3>pH = 12.6</h3>
Answer:
Metallic bonding
Explanation:
Metallic bonding
These type of bonding is observed between the delocalized electrons and the metal cations and is a form of electrostatic bond .
The substance that show these type of bonding , i.e. ,metallic bonding are malleable in nature , because ,
These substance can be moulded to give various shapes ,
As, the layers of atoms can slide on each other and therefore shows the property of malleability.
Hence, from the given information of the question ,
The correct type of bonding is metallic bonding.