Science quiz on atoms
Which statement is true about a proton and an electron?
They have different masses and different charges.
Which phrase describes an atom?
a negatively charged electron cloud surrounding a positively charged nucleus
Which phrase describes an atom?
a positively charged nucleus surrounded by negatively charged electrons
A proton has a charge that is opposite the charge of
an electron
Which particle has the least mass?
an electron
What is the charge and mass of a proton?
charge of +1 and mass of 1 amu
Experimental evidence indicates that the nucleus of an atom
contains most of the mass of the atom
experiments using cathode ray tubes led to the discovery of the
electron
Which group of atomic models is listed in historical order from the earliest to the most recent?
hard-sphere model, Bohr model, wave-mechanical model
Which group of atomic models is listed in historical order from the earliest to the most recent?
hard-sphere model, electron-shell model, wave-mechanical model
According to the wave-mechanical model, an orbital is defined as the
most probable location of electrons
Which particle has a mass that is approximately equal to the mass of a proton?
neutron
Which particle has no charge?
neutron
The major portion of an atom's mass (nucleus) consists of
neutrons and protons
Which subatomic particles are found in the nucleus of an atom of beryllium?
neutrons and protons
Which subatomic particles are located in the nucleus of an He-4 atom?
neutrons and protons
Which phrase describes the charge and mass of a neutron?
no charge and an approximate mass of 1 u
Which part of a helium atom is positively charged?
nucleus
Which term is defined as the region in an atom where an electron is most likely to be located?
orbital
Compared to the charge of a proton, the charge of an electron has
the same magnitude and the opposite sign
What is the approximate mass of a proton?
1 u
Which statement describes the charge of an electron and the charge of a proton?
An electron has a charge of -1, and a proton has a charge of +1.
Modern Atomic Theory
Bohr Model Wave-Mechanical Model
Compared to an electron, which particle has a charge that is equal in magnitude but opposite in sign?
Proton
Which statement describes the location of two types of subatomic particles in a helium atom?
Protons and neutrons are located in the nucleus.
Which statement compares the masses of two subatomic particles?
The mass of a proton is greater than the mass of an electron.