Structure of Matter Flashcards
The Bohr model of the atom consists of the following:
A dense positive nucleus surrounded electrons in definite shells.
The nucleus of an atom contains which of the following? Protons Neutrons Electrons Gamma rays
Protons and Neutrons
Nucleons consist of which of the following? Protons Neutrons Electrons Gamma rays
Protons and Neutrons
The electron shell closest to the nucleus is termed the ____ shell.
K
The third electron shell closest to the nucleus is termed the ____ shell
M
The maximum number of electrons that the O shell can contain is:
50 (O=5….2n^2…..so 2(5^2)= 50)
Which electron shell in an atom has the highest binding energy?
K
The binding energy of the \_\_\_\_ shell in an atom is greater than that of the \_\_\_\_ shell. L; K L; M M; K N; L
L; M
The electron binding energy is
The energy required to remove an electron from its shell.
When an electron is removed from an atom, the atom is said to be
Ionized.
The atomic mass number of an atom is
the number of protons and neutrons.
The atomic number is
the number of protons.
The element 11/5 B has ___ protons in its nucleus
5
The element 11/5 B has an atomic mass of
11
The element 11/5 B has ____ neutrons in its nucleus
6
Elements in the same column in the periodic table have similar _____ properties.
chemical
The number of shells of an atom determines its ___ in the periodic table.
period
The number of electrons in the outermost shell of an atom is equal to its ____ in the periodic table.
group
The periodic table of the elements lists the elements in order of increasing
atomic number.
Isotopes are
atoms with the same atomic number but different mass numbers.
The half-life of a radioisotope is
the time required for radioactivity to be reduced by half.
Electromagnetic radiation includes
xrays
Ionizing radiation consists of
Particulate radiation and electromagnetic radiation.
The binding energy of an electron is measured in a unit called which of the following: electron volt eV keV all of the above.
all of the above.
Kilovoltage is equal to ____ volts
1000
Isotones have the same number of ____ bit different number of _____.
neutrons, protons
Isobars have different number of ____ and different number of ___.
protons, neutrons.
When two atoms share electrons it is called
covalent bonding.
When an atom gives up an electron to another atom it is called
ionic bonding.
X-rays and Gamma rays are often called
photons
X-rays are:
emitted from nucleus of a radioisotope, or
produced outside the nucleus in the electron shells.
produced outside the nucleus in the electron shells.
Gamma rays are:
emitted from the nucleus of a radioisotope, or
produced outside the nucleus in the electron shells.
emitted from nucleus of a radioisotope.
X-rays and gamma exist: at the speed of light 186, 000 miles per second 3 x10 ^8 m/s all of the above
all of the above.
