Unit 2 Atomic Theory Review

Unit 2 Atomic Theory Review

Know the atom . . . know it's past, it's present, prepare for the future!

Multiple Choice

True or False: This model is considered the most modern of all the models we have discussed.

• True

• False

Multiple Choice

Which subatomic particle has a neutral charge and is found inside the nucleus?

• Electrons

• Protons

• Neutrons

• Nucleus

Multiple Choice

Which subatomic particle has a positive charge and is found inside the nucleus?

• Electron

• Proton

• Neutron

• Nucleus

Multiple Choice

What subatomic particle has a negative charge and is found outside of the nucleus?

• Electron

• Proton

• Nucleus

• Neutron

Multiple Choice

The total mass of _________ and _________ is the atomic mass number.

• Negative : Positive

• Neutrons : Protons

• Electrons : Protons

• Nucleus : Protons

Multiple Choice

Which particle is the smallest in mass?

• proton

• neutron

• electron

electrons are smaller

Protons and neutrons both have a mass of 1 amu

Multiple Choice

On the periodic table, Periods are

• Horizontal rows

• Vertical columns

Multiple Choice

On the periodic table, Groups, also known as families, are

• Horizontal rows

• Vertical columns

The element K is potassium

The atomic number is always the smaller whole number.

The atomic mass is always the larger number and is most of the time a decimal.

Multiple Choice

What is the atomic number of potassium (K)?

• 39.098

• 19

• 20

• 40

The element Na is sodium.

There are many elements whose symbols come from the latin or Greek names of the element.

Natrium is latin for sodium. Kalium is latin for potassium.

Multiple Choice

What is the atomic mass of sodium?

• 11

• 22.990

• 12

• 21

The mass number is the atomic mass rounded to the nearest whole number

If you want to find the number of neutrons in an atom, you need to round the atomic mass and then subtract the atomic number

Multiple Choice

What is the mass number of Mercury (Hg)?

• 200.59

• 201

• 80

• 81

Multiple Choice

How many neutrons does Mercury have?

• 80

• 201

• 121

• 281

J.J. Thomson called his model of the atom the Plum Pudding model because of the negative particles scattered throughout the positive atom

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Multiple Choice

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

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Democritus

Multiple Choice

What did Thomson discover?

• electron
• proton
• neutron
• electron cloud

Rutherford discovered that the atom is mostly empty space with a dense, positive nucleus in the middle and negative electrons outside it.

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Multiple Choice

The scientist responsible for "discovering" the nucleus is:

• Bohr
• Rutherford
• Schroedinger
• Einstein

Multiple Choice

The nucleus of an atom can be described as:

• spacious and negatively charged
• dense and positively charged
• spacious and positively charged
• dense and negatively charged

Multiple Choice

How did Rutherford discover the proton?

• Cathode tube ray experiment
• Gold Foil Experiment
• Planetary Model
• Plum Pudding Model

Bohr predicted that those electrons outside the nucleus orbited like planets around the sun in different energy levels

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Multiple Choice

He developed the planetary model of the atom.

• Rutherford
• Bohr
• Chadwick
• Dalton

Multiple Choice

Which model is this?

• Thomson Model
• Rutherford Model
• Cloud Model
• Bohr Model

Multiple Choice

According to the Bohr Model, electrons are only found in specific orbits around the nucleus called __________________________

• Energy Levels
• Electron Lanes
• Electron Places
• Atomic Mass

Schrodinger and Heisenberg used higher math to predict that electrons were not easily located or tracked.

Multiple Choice

• Protons
• Neutrons
• Electrons

Multiple Choice

• Electrons that are inside the nucleus
• Electrons on the outermost energy level 
• Electrons that are closest to the nucleus
• Electrons that have a positive charge

Multiple Choice

Determined that electron paths cannot be predicted and exist inside the Electron Cloud.

• Schrodinger & Heisenberg
• Ernest Rutherford
• John Dalton
• Democritus

Chadwick discovered the neutron in 1932 and completed the modern model of the atom.

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Multiple Choice

Which of the following is NOT part of the modern model of the atom?

• electron cloud

• protons in the nucleus

• electrons orbiting in specific paths

• neutrons in the nucleus

Multiple Choice

Which is the modern model of the atom?