The current on moving the tip in 0.10 nm steps from 0.40 nm to 1.50 nm should be calculated. Concept introduction: The magnitude of the tunneling current I t is given by, I t = V e − c d V − bias voltage C −constant d − distance between the probe and the surface

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 21, Problem 21.13QAP

Interpretation Introduction

Interpretation:

The current on moving the tip in 0.10 nm steps from 0.40 nm to 1.50 nm should be calculated.

Concept introduction:

The magnitude of the tunneling current I_t is given by,

It=Ve−cd

V − bias voltage

C −constant

d − distance between the probe and the surface

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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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