PRE-TEST: ELECTRONIC STRUCTURE OF ATOMS

Which atomic model was proposed as a result of J.J. Thomson’s work?

• Planetary model

• Plum-pudding model

• Indivisible atom model

• Quantum Mechanical model

What occurs when an electron moves from high energy level to a low one?

• Electron configuration will be changed.

• Colored light is given off.

• Process is not possible.

• Atoms move faster.

An orbital can at most hold how many electrons?

• 1 electron

• 2 electrons

• 3 electrons

• 4 electrons

How many orbitals are in the 4p sublevel?

• 2

• 3

• 5

• 7

What contribution did John Dalton make to atomic theory?

• He discovered that atoms had nuclei

• He discovered that every atom was positively charged.

• He discovered that atoms could be divided into smaller parts.

• He discovered that every element consisted of one type of atom that could not be divided.

Arrange the following scientists, according to their contribution in the development of the atom, from earliest to latest: Rutherford, Schrodinger, Dalton, Bohr, Thomson

• Dalton, Schrodinger , Rutherford, Bohr, Thomson

• Thomson, Dalton, Rutherford, Schrodinger , Bohr

• Dalton, Thomson, Rutherford, Bohr, Schrodinger

• Schrodinger , Bohr, Dalton, Rutherford, Thomson

Which of the following statement is correct?

• An electron can absorb energy when it jumps to a higher energy level

• Nucleus is a region in an atom where electron can be found.

• Filling of electrons starts with highest to lowest energy level.

• Fourth shell can hold a maximum of 18 electrons

Based on Rutherford’s gold foil experiment, nucleus is made up of which subatomic particles?

• Electrons and Neutrons

• Neutrons and Protons

• Protons and Electrons

• Electons oly

According to the wave-mechanical model, an orbital is defined as the _____.

• circular path for electrons

• circular path for neutrons

• most probable location of electrons

• most probable location of neutrons

Which of these statement best describes an atom?

• a positive nucleus surrounded by a hard negative shell

• a positive nucleus surrounded by a cloud of negative charges

• a hard sphere with positive particles uniformly embedded

• a hard sphere with negative particles uniformly embedded