Modern Atomic theory
maximum number of electrons per orbital
2
The second energy level has four orbitals and a maximum of __________ electrons.
8
How many orbitals are there at energy level 3?
9
In __________ atomic model, electrons orbit the nucleus only at fixed energy levels.
Bohrs
What are energy levels? Why are they like the rungs of a ladder?
Energy levels are areas located at fixed distances from the nucleus of the atom. They are the only places where electrons can be found. You can stand on one rung or another but not between the rungs. The same goes for electrons. They can occupy one energy level or another but not the space between energy levels.
Which statement about energy levels is false?
There are only two of them.
How do energy levels explain the light given off by fireworks?
When chemicals in fireworks explode, their atoms absorb energy and some of their electrons jump to a higher energy level. When the electrons jump back to their original lower energy level, the atoms give off energy as light. Different chemicals have different arrangements of electrons and give off light of different colors.
scientist who discovered energy levels
bohr
wavelike particles that move around the nucleus of an atom
electron
area surrounding the nucleus of an atom where electrons are likely to be
electron cloud
Bohr's research focused on
electrons
Electrons can jump to a higher energy level if an atom absorb
energy
area located at a fixed distance from the nucleus of an atom where electrons can orbit the nucleus
energy level
All energy levels have the same maximum number of electrons.
false
Electrons are attracted to the nucleus because of the strong force.
false
Energy level 1 has the most energy.
false
Fireworks give off light when their electrons split in two.
false
Scientists can now determine the exact location of any given electron.
false
Since the 1920s, physicists have known that electrons travel in fixed paths.
false
There is a maximum of two orbitals per energy level.
false
Where would you not be likely to find electrons in an atom?
inside the nucleus attached to the nucleus between energy levels
Fireworks give off light energy when their electrons
jump to a lower energy level.
If atoms lose energy, some of their electrons may jump to a(n) __________ energy level.
lower
Energy levels farther from the nucleus have
more orbitals. a greater maximum number of electrons.
The energy level with the least energy is the one closest to the
nucleus
number of orbitals in the first energy level
one
__________ are places in the electron cloud where electrons are most likely to be.
orbitals
scientist who thought that electrons orbit the nucleus like planets orbit the sun
rutherford
Electrons can move from one energy level to another.
true
Some regions of the electron cloud are denser than others.
true
Wavelike particles in the atom exist only where the wave is stable.
true
Electrons behave like both particles and
waves
Electrons bend around the nucleus instead of falling toward it because electrons behave like
waves.
