Honors Semester 1 Exam

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Elements that have similar properties are found in the same

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group.

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Bohr discovered that electrons are located in

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circular orbits around the nucleus.

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Rows on the modern periodic table are called

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periods.

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Groups 1B-10B are called

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transition metals.

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Rutherford's gold foil experiment provided evidence that...

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there is a dense positively charged nucleus at the center of an atom.

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What is the atomic number?

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The number of protons in the nucleus of an atom.

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What is an isotope?

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Atoms of the same element with different numbers of neutrons.

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What are alkali metals?

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Elements in group 1 of the periodic table, highly reactive and have one electron in their outer shell.

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What is the significance of the periodic table?

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It organizes elements based on their properties and atomic structure.

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What are noble gases?

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Elements in group 18 of the periodic table, known for their lack of reactivity.