Differences between metals and non-metals has to be explained by its two chemical and physical properties. Concept introduction: Metals: It is an element which has the following properties: solids at room temperature except mercury, hard in solid state, good conductors of both heat and electricity, ductility, high density, malleability, high melting and boiling point, tendency to form basic oxides by reacting with oxygen, tendency to form positive ion when they looses the electron and get shiny by polishing. Nonmetals: It is an element or substance but not metal, they have the following properties: they may exist as solid, liquid or gas at room temperature, easily breakable, bad conductors of both heat and electricity, melting and boiling points are low, when they react with oxygen they will form acidic oxides, tendency to form negative ions when they looses electron except hydrogen, which forms positive ion, compare to metals, nonmetals will look dull in nature.

Question

The Concept of Aromaticity 21.15 State the number of 2p orbital electrons in each molecule or ion. (a) (b) (e) (f) (c) (d) (h) (i) DA (k) 21.16 Which of the molecules and ions given in Problem 21.15 are aromatic according to the Hückel criteria? Which, if planar, would be antiaromatic? 21.17 Which of the following structures are considered aromatic according to the Hückel criteria? ---0-0 (a) (b) (c) (d) (e) (h) H -H .8.0- 21.18 Which of the molecules and ions from Problem 21.17 have electrons donated by a heteroatom?

Answer 1

Question

Chapter 22, Problem 22.2QP

Interpretation Introduction

Interpretation:

Differences between metals and non-metals has to be explained by its two chemical and physical properties.

Concept introduction:

Metals: It is an element which has the following properties: solids at room temperature except mercury, hard in solid state, good conductors of both heat and electricity, ductility, high density, malleability, high melting and boiling point, tendency to form basic oxides by reacting with oxygen, tendency to form positive ion when they looses the electron and get shiny by polishing.

Nonmetals: It is an element or substance but not metal, they have the following properties: they may exist as solid, liquid or gas at room temperature, easily breakable, bad conductors of both heat and electricity, melting and boiling points are low, when they react with oxygen they will form acidic oxides, tendency to form negative ions when they looses electron except hydrogen, which forms positive ion, compare to metals, nonmetals will look dull in nature.

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The Concept of Aromaticity 21.15 State the number of 2p orbital electrons in each molecule or ion. (a) (b) (e) (f) (c) (d) (h) (i) DA (k) 21.16 Which of the molecules and ions given in Problem 21.15 are aromatic according to the Hückel criteria? Which, if planar, would be antiaromatic? 21.17 Which of the following structures are considered aromatic according to the Hückel criteria? ---0-0 (a) (b) (c) (d) (e) (h) H -H .8.0- 21.18 Which of the molecules and ions from Problem 21.17 have electrons donated by a heteroatom?

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