Chem3.04 Pre-Assessment

The idea of arranging the elements in the periodic table according to their chemical and physical properties is attributed to

• Mendeleev.

• Moseley.

• Bohr.

• Ramsay.

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NGSS.HS-PS1-1

Mendeleev left spaces in his periodic table and predicted the existence of three elements and their

• atomic numbers.

• colors.

• properties.

• radioactivity.

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NGSS.HS-PS1-2

Mendeleev noticed that properties of elements usually repeated at regular intervals when the elements were arranged in order of increasing

• atomic number.

• density.

• reactivity.

• atomic mass.

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Mendeleev predicted that the spaces in his periodic table represented

• isotopes.

• radioactive elements.

• unstable elements.

• undiscovered elements.

The person whose work led to a periodic table based on increasing atomic number was

• Moseley.

• Mendeleev.

• Rutherford.

• Cannizzaro.

Moseley's work led to the realization that elements with similar properties occurred at regular intervals when the elements were arranged in order of increasing

• atomic mass.

• density.

• radioactivity.

• atomic number.

The periodic table

• permits the properties of an element to be predicted before the element is discovered.

• will be completed with element 119.

• has been of little use to chemists since the early 1900s.

• was completed with the discovery of the noble gases.

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NGSS.HS-PS1-1

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Evidence gathered since Mendeleev's time indicates that a better arrangement than atomic mass for elements in the periodic table is an arrangement by

• mass number.

• atomic number.

• group number.

• series number.

The discovery of what elements added a new column to Mendeleev's periodic table?

• noble gases

• radioactive elements

• transition elements

• metalloids

How did Mosley discover the atomic number of elements?

• He determined the number of protons of an atom based on the x-ray wavelength given off the atom when shot with high energy electrons.

• He determined the number of protons of an atom based on atomic mass

• He determined the number of protons of an atom based on its atomic radius

• He determined the number of protons of an atom, based on the color of light given off by the atom when hit with x-rays.