the answer is the last one :All of these
Based on the electronic configuration the elements are classified as metals, non metals and metalloids.
<u>Explanation:</u>
Periodic table consists of three major parts.
The left side consists of metals and the right side consists of non-metals and here Hydrogen element is the exception and in between those two regions we have metalloids, which has the dual character of both metals and non metals.
These elements can be grouped by means of its chemical properties and also due to its outermost electronic configuration.
If the valence shell electrons are same they are categorized under same group.
To calculate the atomic mass of an element, the atomic masses of their isotopes must be considered. Their abundances must also be taken into account. This is the formula used for the calculation:
avg. atomic mass= ∑ <span>(isotope × abundance).
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Answer:
Aluminium Can not rust (Can't rust also meaning <u>Corrode)</u>
Because it's surface is protected by aluminium Oxide which stops the metal below from coming in contact with the air (which contains Oxygen) Unlike rust, which can flake off the surface of iron and steel objects, the layer of aluminium oxide does not flake off.
<u>Corrode</u>
<u>destroy or damage (metal, stone, or other materials) slowly by chemical action.</u>
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Answer:
Covalent bond
ionic bond
Explanation:
Water molecule is formed when two hydrogen atoms combine with one atom of oxygen. The bond through which these atoms are join together is called covalent bond.
The electrons are shared between these atoms but this sharing is not equal. the oxygen atom more strongly pull the electrons to wards itself and thus carry partial negative charge and hydrogen have partial positive charge.
Ionic bond:
The bond between sodium chloride is ionic. This bond is formed due to complete transfer of electron from sodium to chlorine.
Na⁺Cl⁻
The sodium atom carry positive charge and chlorine carry negative charge.
