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What are the 3 particles that make-up the atom?

• protons, neutrons, and isotopes
• neutrons, isotopes, and electrons
• positives, negatives, and electrons
• protons, neutrons, and electrons

What is the number of protons that the element in this image contain?

• 14

• 7

• 15

• 18

Most of the mass in an atom is concentrated in the...

• electrons
• nucleus
• protons
• empty space

True or False? Neutrons have a negative charge

• True

• False

An isotope of an element has the same number of _________, but a different number of _________.

• Protons, electrons
• Protons, neutrons
• Electrons, neutrons

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

What does a represent?

• Proton

• Neutron

• Electron

What does b represent?

• Proton

• Neutron

• Electron

What does c represent?

• Proton

• Neutron

• Electron

An atomic number is also the number of electrons in a neutral atom of that element.

• True

• False