Which statement is true comparing the research of Bohr, Rutherford, and Dalton?

• Dalton and Bohr modeled their experiments and their theories after Rutherford.

• Rutherford and Bohr modeled their experiments and their theories after Dalton.

• Dalton and Rutherford modeled their experiments and their theories after Bohr.

• All three scientists developed their theories at the same time.

Which of the following conclusions is not supported by the data on the above table?

• Atomic radii can be measured for these elements.

• Atomic radii increase from left to right.

• Atomic radii decrease from left to right.

• Atomic radii increases from top to bottom.

Henry Moseley studied x-ray spectra of several elements in a row of the Periodic Table. He found that each element had one more proton than the element immediately to its left.

Which statement best describes Moseley's contribution to the modern Periodic Table?

• Recognizing that elements in the Periodic Table have similar properties

• Grouping elements in the Periodic Table based on their physical properties

• Predicting the properties of missing elements in the Periodic Table

• Providing a basis for ordering elements in the Periodic Table

Some physical properties of elements in a group of the periodic table are described above.

The elements described above belong to which group?

• Alkaline earth metals

• Noble gases

• Alkali metals

• Halogens

Which of these statements accurately describes the trend of ionic energies or atomic radii in the periodic table?

• The atomic radius increases from top to bottom in a group.

• The atomic radius increases from left to right across a period.

• The ionic energies increase from right to left across a period, and bottom to top in a group.

• The ionic energies increase left to right across a period and from top to bottom in a group.

What is the mass number of a carbon isotope that consists of 6 protons, 6 electrons, and 8 neutrons?

• 2

• 12

• 14

• 20

Which of the following is used to calculate the average atomic mass of an element?

• The naturally occurring isotopes

• The five most abundant isotopes

• The isotopes that are man made

• The least common isotopes

Which of the following describes the properties of noble gases?

• They have high boiling points.

• They are highly reactive.

• They are generally nonreactive.

• They are solid at room temperature.

The number of valence electrons in Group 2 elements is —

• 0

• 1

• 2

• 3

As the wavelength of a wave increases, which is also true?

• The energy of the wave will increase.

• The speed of the wave will increase.

• The frequency of the wave will decrease.

• Planck's constant will decrease.