Atomic Theory and Structure of an Atom

What is an atom?

• The smallest particle of an element that still has the properties of that element.

• A combination of two or more elements.

• The largest particle in a chemical compound.

• A type of molecule found in all living organisms.

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Who was the first to name the atom around 400 BC?

• John Dalton

• Dmitri Mendeleev

• Democritus

• Isaac Newton

What does the Greek word 'atomus' mean?

• Small particle

• Indivisible

• Compound

• Sphere

What was John Dalton's model of the atom known as?

• Electron Cloud model

• Quantum Mechanical model

• Solid Sphere model

• Plum Pudding model

According to John Dalton's Solid Sphere model, what are elements made of?

• Different atoms with different masses

• Atoms that can be divided into smaller parts

• Atoms that all have the same mass and compounds are atoms of different elements combined

• Atoms that all have different masses and compounds are atoms of the same element combined

Who developed the first periodic table of elements organized by atomic mass in 1869?

• Albert Einstein

• Dmitri Mendeleev

• Niels Bohr

• Ernest Rutherford

What did the JJ Thomson Plum Pudding Model suggest about the atom?

• The atom is indivisible

• The atom consists of a nucleus surrounded by electrons

• The atom is a positively charged sphere with negative particles embedded throughout

• The atom is a negatively charged sphere with positive particles embedded throughout

What was the key discovery of the Ernest Rutherford Nuclear Model?

• The atom is a solid indivisible sphere

• The atom is a positively charged sphere with negative particles embedded throughout

• The mass of the atom and its positively charged particles were in the nucleus, with low mass negatively charged particles surrounding it

• The atom consists of a central electron surrounded by a cloud of protons

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Which experiment led to the development of the Ernest Rutherford Nuclear Model?

• Cathode ray tube experiment

• Gold foil experiment

• Oil drop experiment

• Alpha scattering experiment

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What did Henry Moseley discover in 1913 that is unique to each element?

• The number of neutrons

• The atomic mass

• The number of protons (atomic number)

• The electron configuration