Unit 1: Atomic Theory Vocabulary

The smallest particle of an element is:

• Molecule

• Atom

• Proton

• Electron

Who was the Greek philosopher that said all matter is made of tiny particles that could not be divided called 'atomos' or atoms?

• Aristotle

• Plato

• Democritus

• Socrates

Which Greek philosopher thought that all substances were made of only four elements—earth, air, fire, and water—and thought there was no limit to the division of matter?

• Aristotle

• Plato

• Democritus

• Socrates

Who was the English chemist and physicist who formulated atomic theory and the law of partial pressures, stating that all matter is made up of individual particles called atoms, which cannot be divided?

• Isaac Newton

• John Dalton

• Michael Faraday

• James Clerk Maxwell

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What did Millikan's Oil Drop Experiment determine?

• The charge of an electron

• The mass of an electron

• The speed of light

• The gravitational constant

What did Rutherford's Gold Foil Experiment propose about the structure of atoms?

• Atoms have a small, dense nucleus surrounded by orbiting electrons.

• Atoms are solid spheres with no internal structure.

• Atoms consist of electrons embedded in a positively charged 'pudding'.

• Atoms are indivisible and indestructible particles.

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What is the nucleus in an atom?

• The nucleus is the central part of an atom, containing protons and neutrons.

• The nucleus is the outer shell of an atom, containing electrons.

• The nucleus is a cloud of electrons surrounding the atom.

• The nucleus is the part of an atom that contains only electrons.

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What is the number of protons in the nucleus of an atom called?

• Atomic number.

• Mass number.

• Neutron number.

• Electron number.

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What is the sum of the number of protons and the number of neutrons in an atom of an element called?

• Mass number.

• Atomic number.

• Electron number.

• Valence number.

An isotope is defined as atoms of the same element that have different numbers of:

• Protons

• Neutrons

• Electrons

• Atomic numbers

Tags

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