Atomic Structure

Which of the following are found in the nucleus?

• protons and electrons

• protons ONLY

• protons and neutrons

• Electrons only

The only element with no neutrons in its nucleus.

• Oxygen

• Helium 

• Hydrogen

• Lithium

Which part of the diagram represents the proton?

• a

• b

• c

• d

"A" is the element's what?

• Atomic mass

• Mass number

• Atomic number

What is the charge on an electron?

• positive 1

• 0

• negative 1

________________ have a positive charge, ___________________ have NO charge, and _____________________ have a negative charge.

• Protons, Electrons, Neutrons

• Neutrons, Electrons, Protons

• Protons, Neutrons, Electrons

• Electrons, Neutrons, Protons

What is the atomic mass of barium

• 56

• 82

• 137

• 138

The structures indicated by F are

• Valence shells

• Electron shells

• Energy levels

Identify #1

• proton

• neutron

• electron

• nucleus

Value representing the number of protons in an element

• Atomic Mass

• Mass Number

• Valence Electrons

• Atomic Number