Atomic Theory and Structure

Isotopes are elements with a different amount of

• protons

• neutrons

• electrons

• atoms

Which particle does not contribute mass to the atom?

• Proton

• Neutron

• Electron

• Nucleus

an element will always have the same number of 

• neutrons

• protons

• isotopes

• atoms

An ______________ is the same element, with the same number of protons, but different numbers of neutrons

• Atom

• Isotope

• Atomic Number

• Mass Number

What is the atomic mass (rounded to the nearest whole number) of this element

• 196

• 196.95

• 197

• 79

Because atoms are neutral, the number of protons will be equal to the number of __________ in an atom.

• Positrons

• Neutrons

• Electrons

• Nuclei

What are the two main parts of the atom?

• nucleus and cytoplasm

• nucleus and electron cloud

• core and electron cloud

• protons and neutrons

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Subatomic particles with a positive charge

• neutrons

• atomic mass

• protons

• isotopes

Subatomic particles that are neutral in charge

• Neutrons

• Protons

• Nucleus 

• Electrons