Atomic Structure

An element occurs as a mixture of isotopes. The atomic mass of the element is based upon

• the masses of the individual isotopes, only

• the relative abundances of the isotopes, only

• both the masses and the relative abundances of the individual isotopes

• neither the masses nor the relative abundances of the individual isotopes

All isotopes of a given element must have the same

• atomic mass

• atomic number

• mass number

• number of neutrons

Tags

NGSS.HS-PS1-8

Isotopes are atoms that have the same number of protons but a different

• number of electrons

• number of neutrons

• atomic number

• nuclear charge

Isotopes of an element have a different

• number of electrons

• number of protons

• atomic number

• mass number

The atomic mass of an element is the weighted average of the masses of

• its two most abundant isotopes

• its two least abundant isotopes

• all of its naturally occurring isotopes

• all of its radioactive isotopes

Tags

NGSS.HS-PS1-8

The atomic mass of an element is the weighted average of the

• number of protons in the isotopes of that element

• number of neutrons in the isotopes of that element

• atomic numbers of the naturally occurring isotopes of that element

• atomic masses of the naturally occurring isotopes of that element

The total mass of the protons in an atom of gold-198 is approximately

• 79 atomic mass units

• 119 atomic mass units

• 198 atomic mass units

• 277 atomic mass units

Which numerical setup can be used to calculate the atomic mass of the element chlorine?

• (34.97 u)(75.76) + (36.97 u)(24.24)

• (34.97 u)(0.2424) + (36.97 u)(0.7576)

• (34.97 u)(0.7576) + (36.97 u)(0.2424)

• (34.97 u)(24.24) + (36.97 u)(75.76)

Which subatomic particles are located in the nucleus of an He-4 atom?

• electrons and neutrons

• electrons and protons

• neutrons and protons

• neutrons, protons, and electrons

Tags

NGSS.HS-PS1-8

Which statement matches a subatomic particle with its charge?

• A neutron has a negative charge.

• A proton has a negative charge.

• A neutron has no charge.

• A proton has no charge.