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