Where are the electrons located in the atom?

• the nucleus

• the electron cloud

• the empty space between the nucleus and the cloud

• none of the above

Who discovered the electron?

• JJ Thomson

• John Dalton

• Neils Bohr

• Ernest Rutherford

If it looks simpler, the model is probably ____________.

• newer

• in development

• older

• undiscovered

How do the Gold Foil Experiment allow Rutherford to discover that most of the mass is in the center of the atom?

• the alpha particles stayed in the center

• the alpha particles went straight through the center

• the alpha particles deflected at large angles

• the alpha particles began orbiting the atom

An atom of lithium will have a charge of _________ when it becomes an ion.

• -2

• +2

• -1

• +1

Which subatomic particles have a mass of 1 amu?

• protons

• neutrons

• electrons

• quarks

How many electrons can go in the first energy level?

• 8

• 2

• 4

• 6

If we change atomic number we will change _____________.

• to an isotope

• to an ion

• energy levels

• the element

Tags

NGSS.HS-PS1-1

To find the number of neutrons.

• proton# - mass#

• mass# - proton#

• electron # - proton #

• proton# - electron#

The weighted average atomic mass is closest to the

• least abundant isotope of an element

• most abundant isotope of an element

• the synthetic isotopes of an element

• the unstable isotopes of an element

Tags

NGSS.HS-PS1-8