
Concept explainers
Which statement is not part of Dalton’s theory? a. Each element is composed of indestructible particles called atoms. b. All atoms of a given element have the same mass and other properties. c. Atoms are themselves composed of protons, neutrons, and electrons. d. Atoms combine in simple whole-number ratios to from compounds.

Interpretation: Amongst the given statements, the statement which is not a part of Dalton’s atomic theory is to be determined.
Concept Introduction: John Dalton was a British school teacher who studied about atoms through various experiments and came up with some postulates related to the atom in 1808.
Answer to Problem 1SAQ
Correct Answer: The statement that theatoms are made up of protons, neutrons, and electrons is not a part of Dalton’s atomic theory.
Therefore, option c is correct.
Explanation of Solution
Reason for correct option:
Dalton stated that “All matter consists of indivisible particles called atoms.” This rules out the possibility of anatom being composed of any other smaller particles like protons, neutrons, and electrons.
Hence, option c is correct.
Reasons for incorrect options:
Option (a) contains a statement that states that each element is made up of indestructible particles called atoms. This is apostulate of Dalton’s atomic theory. So, it is a wrong answer.
Option (b) contains a statement that states that all atoms of a given element have identical masses as well as other properties. This is apostulate of Dalton’s atomic theory. So, it is a wrong answer.
Option (d) contains a statement that states that the atoms combine in the form of whole-number ratios for the formation of compounds. This is apostulate of Dalton’s atomic theory. So, it is a wrong answer.
Hence, options (a), (b), and (d) are incorrect.
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