The reason why Dalton’s assumption that all the atoms of the same element are identical in all their properties is not valid. Concept introduction: Dalton’s atomic theory states that elements are made of tiny particles called atoms. Furthermore, he assumes that the atoms of a given element are identical based on key observations within the eighteenth century. However, this was valid only until the discovery of neutrons. This lead to the speculation, that atom of a given element must have same number of protons and electrons but can have different number of neutrons. (Atoms that are identical in terms of protons and electrons but are different in the number of neutrons are known as isotopes. Hence, the atoms of a given element were no longer identical as they could differ in the number of neutrons.

Question

You have started a patient on a new drug. Each dose introduces 40 pg/mL of drug after redistribution and prior to elimination. This drug is administered at 24 h intervals and has a half life of 24 h. What will the concentration of drug be after each of the first six doses? Show your work a. What is the concentration after the first dose? in pg/mL b. What is the concentration after the second dose? in pg/mL c. What is the concentration after the third dose? in pg/mL

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Question

Chapter 4, Problem 7ALQ

Interpretation Introduction

Interpretation:

The reason why Dalton’s assumption that all the atoms of the same element are identical in all their properties is not valid.

Concept introduction:

Dalton’s atomic theory states that elements are made of tiny particles called atoms. Furthermore, he assumes that the atoms of a given element are identical based on key observations within the eighteenth century. However, this was valid only until the discovery of neutrons. This lead to the speculation, that atom of a given element must have same number of protons and electrons but can have different number of neutrons.

(Atoms that are identical in terms of protons and electrons but are different in the number of neutrons are known as isotopes. Hence, the atoms of a given element were no longer identical as they could differ in the number of neutrons.

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