Each electron shell corresponds to a different
A) number of charges on each electron.
B) chemical element or compound.
C) ion or group of ions.
D) atom or molecule.
E) electron energy level.
An element with an atomic number of 8
A) was the eighth element discovered.
B) contains atoms with four protons and four neutrons.
C) is composed of atoms with only eight protons.
D) has eight electrons in the outer shell of each atom.
E) has six protons and two neutrons.
What is an atom's spectrum?
A) the total number of photons an atom can contain
B) sum of photons an atom will emit
C) the atomic mass of the atom
D) the atom's place in the periodic table
E) the allowed orbit closest to the nucleus
Which instrument below emits photons that have wave crests in exact alignment?
A) electron microscope
B) light amplification by stimulated emission of radiation
C) telescope fitted with a spectroscope
D) spectroscope which is not part of a telescope
E) a source of alpha particles in a physics laboratory