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Atomic Theory: MCQ1

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Questions and Answers

What is the primary characteristic that defines isotopes?

Same mass number but different atomic number

Same number of protons but different numbers of neutrons (correct)

Different number of protons in the nucleus

Different number of electrons in the outermost shell

Which scientist is credited with naming the electron?

Ernest Rutherford

JJ Thomson

Robert Milikan

Johnstone Stoney (correct)

What is the consequence of the Law of Conservation of Mass?

Matter can be created or destroyed in a chemical reaction

Atoms cannot be created or destroyed in the course of a chemical reaction (correct)

The mass of reactants is always greater than the mass of products

Atoms can be created or destroyed in a chemical reaction

What is the name of the experiment conducted by Ernest Rutherford?

Gold Foil experiment Signup and view all the answers

What is the characteristic of cathode rays according to JJ Thomson?

They are negatively charged Signup and view all the answers

What is the result of the α-particle scattering experiment according to Ernest Rutherford?

A large number of α-particles were not deflected at all Signup and view all the answers

What is the term for the sum of the number of protons and neutrons in the nucleus?

Mass number Signup and view all the answers

Who is credited with the development of the Bohr model?

Neils Bohr Signup and view all the answers

What is the definition of relative atomic mass ?

The relative atomic mass is the average mass of an atom relative to 1/12 the mass of an atom of carbon-12 Signup and view all the answers

What is the significance of the Maltese Cross experiment conducted by William Crookes?

It demonstrated the existence of cathode rays Signup and view all the answers

What is the primary characteristic of isotopes that distinguishes them from one another?

Different number of neutrons Signup and view all the answers

What is the significance of the oil drop experiment conducted by Robert Millikan?

It determined the charge of an electron Signup and view all the answers

What is the primary characteristic of the Bohr model of the atom?

It assumes that electrons occupy specific energy levels Signup and view all the answers