Science quiz on atoms

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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.


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