Bohr's Model of an Atom, Intro. to Quantum Mechanical Model

An atom is

• A fundamental subatomic particle of all matter

• The smallest partcle of an element that changes its identity during chemical reaction

• The smallest partcle of an element that retains its identity during chemical reaction

An electron is

• a negatively charged subatomic particle that almost 2000 times lighter than a proton and moves around the nucleus of an atom

• a positively charged subatomic particle that almost 2000 times lighter than a proton and moves around the nucleus of an atom

• a neutral subatomic particle that almost 2000 times lighter than a proton and moves around the nucleus of an atom

• a negatively charged subatomic particle that has the same mass as a proton and is located in the nucleus of an atom

Ernest Rutherford was

• A physicist who proposed a model of an atom in which an electron is found only in specific orbits with fixed energies around the nucleus.

• A physicist who discovered the first subatomic particle - an electron, and demonstrated that an atom is divisible. Proposed Plum-Pudding model of an atom

• A physicist who performed Gold Foil Experiment and demonstrated that an atom is mostly an empty space and the nucleus of an atom is positively charged and contains most of the mass of an atom.

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Choose all limitaions of Rutherfod't model of an atom that apply.

• Model explained the behavior of an electron only in an atom of hydroge

• Model couldn't explain why metals or its compounds give off characteristic colors when heated in flame

• Model was based only on mathematical calculations and didn't support experimental results

• Model couldn't explain chemical properties of elements

• Model couldn't explain why objects change colors when heated

Niels Bohr was

• A physicist who proposed a model of an atom in which an electron is found only in specific orbits with fixed energies around the nucleus. An electron in the model needs to absorb or emit energy to move from one orbit to another

• A physicist who discovered the first subatomic particle - an electron, and demonstrated that an atom is divisible. Proposed Plum-Pudding model of an atom

• A physicist who performed Gold Foil Experiment and demonstrated that an atom is mostly an empty space and the nucleus of an atom is positively charged and contains most of the mass of an atom.

• A physicist who gave the foundation to quantum mechanics. Intorduced a theory describing the behavior of an electron by a wave equation

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Orbits in Bohr's model of an atom could be described as ...

• Specific circular paths around the Sun where planets are located

• Specific circular paths around the nucleus where electrons are located

• Areas around the nucleus where there is a high probability for electrons to be present

Energy levels in Bohr's model of an atom could be described as ...

• Orbits with fixed energies where an electron moves around an atom

• Orbits with a wide range of energies where an electron moves around an atom

Quantum is...

• Specific circular paths around the nucleus where electrons are located

• The amount of energy required to move an electron from one energy level to another energy level.

• Energy levels where electrons of an atom are located

When an electron gains a quantum of energy..

• it stays in the ground state and doesn't move anywhere

• it moves to the lower energy level

• it moves to the higher energy level

When an electron loses s a quantum of energy..

• it stays in the ground state and doesn't move anywhere

• it moves to the lower energy level

• it moves to the higher energy level