Atomic Structure and Periodicity

List the postulates of Dalton that continue to have significance (are retained in modern atomic theory).

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Match the atomic theory statements in part A with the matching items in part B.

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A nitrogen-oxygen compound is found to have an oxygen-to-nitrogen mass ratio of 1.142 g oxygen for every 1.000 g of nitrogen. Which of the following oxygen-to-nitrogen mass ratio(s) is/are possible for different nitrogen-oxygen compound(s)?

• 2.285

• 0.571

• 1.000

• 2.500

Determine, which of the following oxygen-to-nitrogen mass ratio(s) is/are also possible for nitrogen-oxygen compound. (Refer Example 2.1 No. 1 for required information)

• 0.612

• 1.713

• 1.250

• 2.856

What did Robert A. Millikan determine by observing the behavior of electrically-charged oil drops in an electric field?

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What did James Chadwick discover in 1932?

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Why do isotopes of an element have similar chemical properties?

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Identify element X whose atoms contain 24 protons and write the symbol for the isotope with 28 neutrons

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What is the mass number of an isotope of tin that has 66 neutrons and 50 protons?

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What is the formula to calculate the Bohr radius?

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