Unit 2 Review

Unit 2 Review

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Poll

How would you rate the your confidence with this unit?

• Very Confident

• Confident

• Somewhat Confident

• Not Very Confident

Multiple Choice

In the gold foil experiment, most of the positively charged alpha particles passed through the gold foil, but some were deflected or bounced back.  What did we conclude because of this?  

• Atoms are small indivisible spheres
• Atoms are mostly empty space with a small, dense, positive center
• Atoms have negatively charged particles which orbit the nucleus
• Light is a wave, not a particle

Multiple Choice

In Rutherford's famous "Gold Foil" experiment, some particles passed through the foil, some were deflected, and some were bounced straight back. This observation made Rutherford conclude

• gold atoms have a solid nucleus

• gold atoms can conduct electricity

• gold atoms are denser than other metals

• gold's elections orbit the nucleus at definite distances from the center

Multiple Choice

The cathode-ray tube was used to discover the ____ by ____.

• electron by Thomson

• electron by Dalton

• proton by Thomson

• proton by Dalton

• electron by Rutherford

Multiple Choice

In the atomic model nicknamed the "plum pudding" model, what do the plums represent?

• the nucleus

• the atom

• the electrons

• the positive material

Multiple Choice

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

• 18 protons

• 40 protons

• 22 protons

• 21.9 protons

Multiple Choice

The electron is not included in the calculations for the atomic mass because

• It has negative charge

• It is located in the outer energy levels of the atom

• Its mass is basically zero

• It attracts neutral particles

Multiple Choice

Measure mainly of the nuclear particles: protons + neutrons

• Subatomic Particles
• Atomic Number
• Atomic Mass
• Gluons

Multiple Choice

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Multiple Choice

How many protons are in a Chlorine atom?

• 17

• 35

• 35.45

• 18

Multiple Choice

How many electrons are present in an atom of Be-9

• 2

• 4

• 5

• 9

Multiple Choice

How many protons, electrons, and neutrons does an atom with an atomic number of 50 and a mass number of 125 contain?

• 75 protons, 50 electrons, and 70 neutrons

• 50 protons, 50 electrons, and 75 neutrons

• 50 protons, 75 electrons, and 120 neutrons

• 50 protons, 75 electrons, and 50 neutrons

Multiple Choice

What is the atomic mass of Neon?

• 10

• 20.18

• 10.18

• 30.18

Multiple Choice

What do these isotopes of carbon all have in common?

• neutrons & mass number
• atomic number and neutrons
• atomic number and electrons
• protons, atomic number, and mass number

Multiple Choice

which atom has  4 neutrons?

• Li-6
• Li-7
• Li-8
• they have the same # of neutrons

Multiple Choice

How many neutrons does the isotope of lithium have?

• 8

• 3

• 4

• 5

Multiple Choice

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

Periodic Table Organization

Organization and groups

• ​There are 7 periods.

• Each row represents an added electron energy level.​

Periods (rows)

• ​There are 18 groups

• Each group in the main block elements is equal to the number of valence electrons. (Ex. group 13 = 3 valence electrons​

​​Groups (columns)

​

• Elements in the same group have similar properties

  • The properties are tied to the electron configuration​

• 5 main groups to know their properties

​

​Some text here about the topic of discussion.

Groups/Families

​

As mentioned in the previous slide, as we add rows to the periodic table, we are adding energy levels to the atoms. This is the reason for the pattern seen above. As we proceed down the group, the atoms get larger. But as we go across the period, the atoms get smaller due to the increased nuclear size. The bigger nucleus increases the level of attraction and makes the atom smaller.

Atomic Size

​

The pattern seen here is inversely related to the image to the left. The graph above shows that as the atoms get bigger it is easier to remove electrons from the valence shell. And as the atoms get smaller, it is harder to remove electrons from the valence shell. This is the same pattern for electronegativity

​​Ionization energy

​

Electron configuration is used to show the location of electrons in the atom. Use the diagram above to refresh your mind. Remember the four orbital shapes and the four blocks of the periodic table. (refer to your periodic table if you still have it.) ​

Electron Configuration

Multiple Choice

The vertical columns on the periodic table are called:

• periods

• elements

• groups

• matter

Multiple Choice

The horizontal rows on the periodic table are called:

• periods

• elements

• groups

• matter

Multiple Choice

Which group are the Halogens in?

• 1

• 2

• 17

• 18

Multiple Choice

Which group are the Noble Gases in?

• 1

• 2

• 17

• 18

Multiple Choice

Which group are the Alkaline Earth Metals in?

• 1

• 2

• 17

• 18

Multiple Choice

Which element has the greatest ionization energy: Aluminum (Al)    or    Chlorine (Cl)?

• Aluminum (Al)
• Chlorine (Cl)

Multiple Choice

Which element has the greatest electronegativity: Nitrogen (N) or Arsenic (As)?

• Nitrogen (N)
• Arsenic (As)

Multiple Choice

Which is an alkali metal?

• Magnesium
• Iron
• Sodium
• Europium

Multiple Choice

I am a nonmetal

I am in period 2

I am in group 16/6A

• Ba

• Si

• Ba

• O

Multiple Choice

Of the halogens, which has the smallest radius?

• F

• Br

• He

• At

Multiple Choice

What atom matches this electron configuration?
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

• Zinc
• Copper
• Nickel
• Germanium

Multiple Choice

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶4s²3d¹

Multiple Choice

The electron configuration of an atom is 1s²2s²2p⁶.  The number of electrons in the atom is 

• 3
• 6
• 8
• 10

Multiple Choice

This orbital diagram represents:

• Carbon

• Boron

• Nitrogen

• Oxygen

Multiple Choice

What is incorrect about this orbital diagram?

• Both arrows in the 2p box should be pointing up

• There are too many electrons in the 1s orbital

• In the 2p boxes, there should only be 1 electron in the first 2p box and one in the 2nd 2p box

• All the arrows should be pointing up

Multiple Choice

This orbital diagram represents which element?

• Sodium

• Magnesium

• Aluminum

• Iron

Poll

How would you rate your confidence now?

• very confident

• confident

• somewhat confident

• not very confident