Periodic Table Unit 1 Review

Semiconductors are elements that

• have large atomic masses but small atomic numbers.

• do not form compounds.

• can conduct heat and electricity under certain conditions.

• are extremely hard.

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In Mendeleev's periodic table, elements in each column had similar

• atomic masses.

• propeties

• atomic number.

• symbols.

Elements in an element family have similar

• atomic symbols.

• atomic sizes.

• atomic weights.

• chemical properties.

Which statement about noble gases is correct?

• They form compounds with very bright colors.

• They exist as single atoms rather than as molecules.

• They are highly reactive with both metals and nonmetals.

• They are extremely rare in nature.

Which is not a family of the periodic table?

• alkaline-earth metals

• anions

• halogens

• noble gases

Who was the first person to study atomic theory?

• Dalton
• Democritus
• Chadwick
• Miller

The word 'atomos' termed by Democritus means:

• Indivisible
• Unconscious
• Blue
• Nuclear powered

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Developed the “chocolate chip cookie” model of the atom

• James Chadwick
• Niels Bohr
• Schrodinger & Heisenberg
• J.J. Thomson

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Developed the very first atomic theory

• Ernest Rutherford
• Schrodinger & Heisenberg
• Niels Bohr
• John Dalton

Discovered the electron

• Bohr
• Dalton
• Rutherford
• Thomson