Baez Atomic Theory Test

What was revolutionary about Mendeleev's periodic table?

He predicted properties of undiscovered elements.

What discovery corrected Dalton's idea that atoms are indivisible?

The discovery of subatomic particles.

Which element forms a -2 ion and belongs to the same group as oxygen?

Sulfur.

What experiment determined the charge of an electron?

Millikan's oil drop experiment.

Which particle contributes most to the mass of an atom but not to its charge?

Neutron.

What conclusion explains the discovery of the neutron?

It accounts for isotopes having different mass numbers.

Which scientist's work showed that atoms are mostly empty space?

Rutherford.

Which isotope pair represents atoms of the same element?

12C and 14C.

Which subatomic particle determines the identity of an element?

Proton.

What property increases across a period from left to right?

Ionization energy.

What did Rutherford's gold foil experiment disprove?

The 'plum pudding' model.

Which experiment led to the discovery of the electron?

Thomson's cathode ray tube experiment.

How is the modern periodic table arranged?

By increasing atomic number and repeating chemical properties.

Who provided the first evidence that electrons behave as waves?

De Broglie.

Which family is known as the 'alkali metals'?

Group 1.

Which family is chemically inert due to stable electron configurations?

Noble gases.

What best describes isotopes?

Same atomic number, different mass numbers.

Which particle did Thomson first identify?

Electron.

What property is shared by all members of the halogen family?

They form diatomic molecules.

Who discovered the neutron?

Chadwick.

Which element would you predict has the largest atomic radius?

Any element most down and/or to the left of the periodic table

Which evidence supports Bohr’s model of the atom?

Quantized emission spectra of hydrogen

The discovery of isotopes revised the part of Dalton’s atomic theory stating that all atoms are ____.

the same

Bohr’s hydrogen model correctly explained that electrons exist in ___ energy levels.

different