Models of the Atoms Practice

What was lacking in Democritus's atomic theory?

• A mathematical model

• Evidence to support the atom

• A philosophical basis

• A chemical reaction explanation

What did John Dalton propose about atoms of a given element?

• They are different

• They are identical

• They are flexible

• They are divisible

What did John Dalton believe about the divisibility of atoms?

• Atoms are divisible

• Atoms are indivisible

• Atoms can be split

• Atoms are flexible

Tags

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What did Dalton propose about the atoms of different elements?

• They are identical

• They are different

• They are flexible

• They are divisible

Who discovered the electron?

• Dalton
• Thomson
• Rutherford
• Bohr
• Schrodinger

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. It depicts electrons floating freely in a positively charged region.

• The "Plum Pudding Model" of the atom

• The "Rutherford Model" of the atom

• Democritus's model of the atom

• The "Quantum Mechanical Model" of the atom

How did Thomson's Plum Pudding Model describe the atom?

• a solid sphere of negative charge with small positive charges embedded
• a solid sphere of positive charge with small negative charges embedded
• a solid sphere of negative charge surrounded by positive charges on rings
• a solid sphere of positive charge surrounded by negative charges on rings

Where did Rutherford's model state the electrons were located?

• Electron Cloud

  (space around the nucleus)

• Orbits

• Orbitals

• Moving around a positively charged space.

Where is all the positive charge and most of the mass of an atom located according to Rutherford?

• Electrons

• Orbits

• Nucleus

• Shells

Tags

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According to Bohr's model, what must electrons gain to jump from one energy level to another?

• Mass

• Speed

• Energy

• Charge