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Structure A is

• The valence shell

• An electron shell

• An energy level

Structure B is

• The nucleus

• An electron shell

• An energy level

Structure C is a(n)

• Proton

• Neutron

• Electron

Structure D is a(n)

• Proton

• Neutron

• Electron

Structure E is a(n)

• Proton

• Neutron

• Electron

The structures indicated by F are

• Valence shells

• Electron shells

• Energy levels

Structure E has what charge?

• Neutral

• Positive

• Negative

Structure D has what charge?

• Neutral

• Positive

• Negative

"A" is the element's what?

• Atomic mass

• Mass number

• Atomic number

"B" is the element's what?

• Atomic mass

• Mass number

• Atomic number