Chapter Atomic Nucleus and Radioactivity
An alpha particle consists of
2 Protons t tun neutrons
Which experiences the greatest electrical force in an electric field?
Alpha particles
The reason alpha rays are easy to stop is that they
Are doubly charged, relatlivy big, v slope down eaisly
What is emitted in radioactive decay?
Electron, beka rays, alpha particles,high energy electromagnetic radiation
27. All elements except hydrogen have isotopes.
False
All isotopes are radioactive.
False
Alpha rays are charged positively.
False
An ionized atom has the same number of protons as electrons.
False
Neutrons are stable particles and can last for millions of years by themselves without spontaneously decaying.
False
The elements beyond uranium in the periodic table are known as transuranic elements and are produced natural transmutation of elements.
False
The half-life of an isotope is the time needed for half its mass to change to energy.
False
The mass of an atom distributed equally among the protons, neutrons, and electrons.
False
Uranium dating has been used to prove that the moon is 2.7 billion years old.
False
Uranium dating is another way to date materials, but it is limited to rocks that have been formed only recently the history of Earth.
False
When used to trace the progress of food through the digestive system, radioactive isotopes are known as trackers.
False
Nucleons are bound to each other by an attractive force called the nucleon force.
Farse
The type of radition that eill pentrate fartherest into material is
Gamma rays
Which radiation has no electric charge associated with it?
Gamma rays
X-rays are similar to
Gamma rays
An atom is called an ion if there
Is an uneven number of Protons & electrons
The atomic number of an atom or ion refers to the number of
Proton
2. The force that holds the nucleus together is the
Strong force
Archeologists use a technique called carbon dating to establish dates of bones and wooden artifacts.
True
Everyday plants take in some radioactive carbon-14 through carbon dioxide molecules.
True
It is impossible for a hydrogen atom to emit an alpha particle.
True
Of the three major kinds of radioactivity, gamma rays can penetrate the farthest into a material.
True
The atomic number of an element is the same as the number of protons in the nucleus of an atom of that element.
True
The changing of one element into another is called transmutation.
True
The nucleus of an atom consists of small particles called nucleons.
True
Two round-trip flights between New York and San Francisco normally expose you to as much radiation as a single chest X-ray.
True
Uranium is the heaviest naturally occurring element normally found in Earth's crust.
True
The two easily detectable products of the decay of a free neutron are
a Proton and electron
Which experiences the least electrical force in an electric field?
gamma rays
When alpha and beta rays pass through a magnetic field, their paths change
in Opposite divections
The atomic mass number of an atom refers to the number of
nucleons (protons and neutrons)
The nucleus of an atom consists of
protons and neutrans.
Electrical forces within an atomic nucleus tend to
push it apart
Large nuclei like uranium are radioactive because
they're too large for the strong force to Contract electrostatic replusion
5. Generally speaking, the heavier a nucleus is, the more it is
unstable
