Atom test review for monday 8
which principal energy level change by the electron of a hydrogen atom will cause the greatest amount of energy to be absorbed
n=2 to n=5
the atomic mass of an element is defined as the weighted average mass of that elements
naturally occurring isotopes
the major portion of an atom's mass consist of
neutrons and protons
what are the nucleus in an atom
protons and neutrons
atoms of 16O, 17O and 18O have the same number of
protons but different neutrons
when electrons in an atom in an excited state fall to lower energy levels energy is
released only
what causes the emission of radiant characteristic spectral lines
return of electrons to lower energy levels
compared to the entire atom, the nucleus of the atom is
smaller and contains most of the atom's
which group 18 element in the ground state has maximum of 2 completely filled energy shells
Ne
What is the nuclear charge of an atom with a mass of 23 and an atomic number of 11
11+
Which of the following atoms has the greatest nuclear charge
14 N 7
which electron configuration represents an atom in an excited state also
2-0-1
when electron configuration represents an atom in an excited state
2-2-1
as an atom in the excited state returns to the ground state the energy of the atom
decreases
if 75% of the isotopes of an element have a mass of 35 amu and 25% of the isotopes have a mass of 37 amu, what is the atomic mass of the element
35.5 amu
what is the mass number of an atom that contains 19 protons, 19 electrons, and 20 neutrons
39
what is the mass number of an atom that consists of 20 protons, 20 neutrons and 18 electrons
40
which isotope contains the greatest number of neutrons
40AR
The mass of an electron is approximately equal to 1/1836 of the mass of
a proton
a neutral atom with 6 electrons and 8 neutrons is an isotope of
carbon
experiments with gold foil indicated that atoms
contain a positively charged, dense center
electron x can change to a higher energy level or a lower energy level. which statement is true
electron x absorbs energy when it changes to a higher energy level
In rutherfords foil experiments..... Which statement about gold atoms is supported by these experimental observations
gold atoms consist mostly of empty space
as an electron moves from its ground state to an excited state the potential energy of the atom
increases