Atoms: Journey Through Time Question Preview (ID: 14362)


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An element has an atomic number of 30. How many protons and electrons are in a neutral atom of the element?
a) 30 protons, 30 electrons
b) 15 protons, 15 electrons
c) 60 protons, 30 electrons
d) 30 protons, 0 electrons

How is the number of neutrons in the nucleus of an atom calculated?
a) Add the number of electrons and protons together.
b) Subtract the number of electrons from the number of protons
c) Subtract the number of protons from the mass number.
d) Add the mass number to the number of electrons.

The mass number of an element is equal to
a) the total number of electrons.
b) the sum of the protons and neutrons.
c) less than twice the atomic number.
d) a constant number for the lighter elements.

The atomic number of an element is the total number of which atomic particles?
a) Neutrons
b) Protons
c) Electrons
d) Protons, electrons, and neutrons

Select the correct statement about subatomic particles.
a) Electrons are negatively charged and are the heaviest subatomic particle.
b) Protons are positively charged and are the lightest subatomic particle
c) Neutrons have no charge and are the lightest subatomic particle.
d) The mass of a neutron nearly equals the mass of a proton.

Which of the following is correct concerning subatomic particles?
a) The electron was discovered by Goldstein in 1886.
b) The neutron was discovered by Chadwick in 1932
c) The proton was discovered by Thomson in 1880.
d) Cathode rays were found to be made of protons.

Which statement about the discovery of electrons is true?
a) Electrons were discovered by experimental chemists.
b) Electrons were discovered after the TV tube was invented.
c) Electrons were discovered in a vacuum tube.
d) Electrons were discovered when an electric current was passed through gases at low pressures.

What particles form the nucleus of an atom?
a) protons and neutrons
b) protons and electrons
c) neutrons and electrons
d) protons, neutrons, and electrons

Dalton's atomic theory includes which idea?
a) All atoms of all elements are the same size.
b) Atoms of the same element are always identical.
c) Individual atoms can be seen with a microscope.
d) Atoms of different elements always combine in one-to-one ratios

Using the periodic table, determine the number of neutrons in carbon.
a) 12
b) 2
c) 6
d) 18

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