Topic 3 Lesson 1 Open-Note Quiz

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What are the TWO main parts of the Atomic Theory that we know to be true?

• All matter consists of very tiny particles or atoms that can’t be broken down or divided into smaller parts.
• Different isotopes of the same element have the SAME mass numbers.
• All the atoms of the same kind are uniform in size, weight, and other properties.
• Different numbers of ELECTRONS cause “isotopes” of an element.

What TWO things do you add together to get the mass number of an atom?

• Electrons
• Alpha Particles
• Neutrons
• Protons

Different isotopes of an element generally have the same physical and chemical properties because they have the same number of _________.

• Electrons
• Alpha Particles
• Neutrons
• Protons

Different numbers of ________ cause “isotopes” of an element.

• Electrons
• Alpha Particles
• Neutrons
• Protons

What are TWO ways we can figure out the number of neutrons in an atom?

• mass number - protons
• Mass Number - Atomic Number
• by their atomic number
• by their mass number

Who discovered that the atom is mostly empty space with a dense center called a nucleus?

• Dalton
• Thomson
• Rutherford
• Bohr

Whose model showed that the atom looked like Plum Pudding, with electrons embedded in the pudding?

• Dalton
• Thomson
• Rutherford
• Bohr

Which model of the atom PROPERLY shows how most electrons behave?

• Schrodinger
• Thomson
• Rutherford
• Bohr

What are the units used to measure atoms?

• grams
• kilograms
• atomic mass units
• ounces