Question

What is the valency of Lead. Also draw shell diagram .Also explain what is its valancy

Answer 1

Lead is present down the 14th group. as all heavy elements have some instability in configuration of electrons they undergo inert pair effect. ... Lead is more stable in valency 2 than 4. Hence, lead shows the valency of 2.

Answer 2

Non-metals do not possess the property exhibited by the metals. They appear to be dull, but elements like iodine and diamonds are the exceptional non-metals that have a shiny appearance.

non-metal

It generally exists in all 3 forms of matter i.e., solid, liquid and gas. Non-metals in solid form are generally soft and thus completely gets converted into powdered mass after the application of force on it. Thus are said to possess brittle nature.

But diamond is again an exception over here because it is one of the hardest substances hence are not brittle. Non-metals holds 4, 5, 6 or 7 electrons in their outermost shell thus usually have a tendency to accept electrons. Thus it forms anions. These elements exhibit a low degree of melting and boiling point. However, non-metals like silicon and carbon have high melting and boiling point.

Non-metals generally do not react with acid but readily react with air and are said to be great oxidizing agents.

Key Differences Between Metals and Non-Metals

Metals are considered to be electropositive in nature due to their ability to donate electrons. Whereas non-metals are electronegative as they generally accept electrons.

Metals are generally found in solid-state but non-metals exist in all the 3 states of matter i.e., solid, liquid and gas.

Metals shows the property of malleability while non-metals are non-malleable.

Metals are generally those substances that have a shiny surface and thus are lustrous. Whereas non-metals have non-shiny appearance and thus falls under the category of non-lustrous substances.

The bond formed between metals is said to be metallic bonding. While the bond formed between two non-metals is a covalent bond.

Metal possesses high tensile strength as there exists strong attraction between molecules. However, due to weak iMetals holds the left side position on the periodic table. But non-metals are usually found on the right side in the periodic table.

Metals exhibit high melting and boiling point except mercury. As against the melting and boiling point of non-metals are generally low except carbon and silicon.