Question Set 5
when a nucleus emits a neutron, its atomic mass
decreases by 1
when a nucleus emits a positron, its atomic number
decreases by 1
when radium (Z=88) emits an alpha particle, the resulting nucleus has atomic number
86
when thorium (Z=90) emits a beta minus particle (electron), the resulting nucleus has atomic number
91
the half life of a radioactive substance is INDEPENDENT of
all of these
an element will decay to an element with higher atomic number in the periodic table if it emits
an electron
an atom with an imbalance of electrons to protons is
an ion
when a nucleus emits a beta particle, its atomic number
changes, but its mass number remains constant
when a beta minus particle (electron) is ejected from a nucleus, the nucleus the has appreciably greater
charge
when a nucleus emits a proton, its atomic number
decreases by 1
when a nucleus emits a beta minus particle (electron), its atomic mass
doesnt change
when a nucleus emits a positron, its atomic mass
doesnt change
which radiation has no electric charge associated with it
gamma
when a nucleus emits a beta minus particle (electron), its atomic number
increases by 1
when a nucleus emits a neutron, its atomic number
increases by one
when a gamma ray is ejected from the nucleus, the nucleus then has appreciably less
neither of these
different isotopes of an element have different numbers of
neutrons
the half life of an isotope is one day. at the end of two days the amount that remains undecayed is
one-quarter
a nucleon is either a
proton or a neutron
the atomic number of an element is the same as the number of its
protons
suppose you have a radioactive rock with a mass of 1000 g. you lock the rock safely away in a closet and do not disturb it for 6 years. what will be the mass of the rock after those 6 years if the half-life of the sample is 2 years
very slightly less than 1000 g
