Chemistry - 5.1 Revising the Electron Model - Quiz

Dalton proposed which of the following models of the atom?

• The atom is a tiny, indestructible particle with no internal structure.

• The atom is a sphere of positive electrical charge with electrons embedded in the sphere.

• Most of an atom's mass is concentrated in the small, positively charged nucleus. The electrons are in motion in the space around the nucleus.

• Electrons move in circular orbits at fixed distances from the nucleus.

J.J. Thomson proposed which of the following models of the atom?

• The atom is a tiny, indestructible particle with no internal structure.

• The atom is a sphere of positive electrical charge with electrons embedded throughout the sphere; "plum-pudding" model.

• Most of an atom's mass is concentrated in the small, positively charged nucleus. The electrons are in motion in the space around the nucleus. The atom mostly consists of empty space.

• Electrons move in circular orbits at fixed distances from the nucleus.

Ernest Rutherford proposed which of the following models of the atom?

• The atom is a tiny, indestructible particle with no internal structure.

• The atom is a sphere of positive electrical charge with electrons embedded throughout the sphere; "plum-pudding" model.

• Most of an atom's mass is concentrated in the small, positively charged nucleus. The electrons are in motion in the space around the nucleus. The atom mostly consists of empty space.

• Electrons move in circular orbits at fixed distances from the nucleus.

Neil Bohr proposed which of the following models of the atom?

• The atom is a tiny, indestructible particle with no internal structure.

• The atom is a sphere of positive electrical charge with electrons embedded throughout the sphere; "plum-pudding" model.

• Most of an atom's mass is concentrated in the small, positively charged nucleus. The electrons are in motion in the space around the nucleus. The atom mostly consists of empty space.

• Electrons move in circular orbits at fixed distances from the nucleus.

True or False:

The electrons in an atom can exist between energy levels.

• False

• True

What are the fixed energies of electrons called?

• energy levels

• spins

• clouds

• positions

A quantum of energy is the amount of energy required to . . .

• move an electron from its present energy level to a higher one.

• maintain an electron in its present energy level.

• place an electron in an energy level.

In general, the higher the electron is on the energy "ladder", the ________________ it is from the nucleus.

• farther

• closer

What is the main difference between the previous models of the atom and the modern quantum mechanical model?

• The quantum mechanical model uses mathematical equations to describe the behavior of electrons.

• The quantum mechanical model places electrons within energy levels.

• The quantum mechanical model organizes the atom as a positive nucleus surrounded by orbiting electrons.

True or False?

The quantum mechanical model of the atom estimates the probability of finding an electron within a specific region.

• True

• False