Periodic Trends Review

Periodic Trends Review

Chemistry

Click here for Introduction to Lesson

Let's Review the Atomic Radius Trend

Notice the radius gets smaller as you go across a period and larger as you go down a group

Click here for an explanation of the Atomic Radius Trend

Open Ended

Why does the Atomic Radius increase as you go down a group but decrease as you go across a period?

Multiple Choice

Which of the following has a greater Atomic Radius? (Refer to your periodic table)

• Carbon

• Aluminum

• Potassium

• Oxygen

Multiple Choice

Which periodic group has the smallest atomic radius?

• Alkali metals
• Halogens
• Noble Gases
• Transition metals

Multiple Choice

Which atom has the largest atomic radius?

• potassium

• rubidium

• francium

• cesium

Multiple Choice

Which of the following will have a larger radius than Zinc?

• Gallium
• Aluminum
• Magnesium
• Strontium

Multiple Choice

Which of the following has the correct arrangement (smallest to largest) according to the atomic size?

• K, He, Ca, I

• He, K, Ca, I

• He, I, K, Ca

• Ca, K, I, He

Multiple Choice

Which of the following ions is larger

• Ca²⁺

• Mg²⁺

Multiple Choice

Which ion is larger

• Cl^-

• P^3-

Multiple Choice

Which is larger:

P or P^-3

• P

• P^-3

• both are same size

Multiple Choice

Which is larger:

P or P^-3

• P

• P^-3

• both are same size

Ionization Energy Trend

Ionization energy is the energy required to remove an electron from atom. The larger the atom the easier it is to remove an electron.

Multiple Choice

What is Ionization energy?

• The energy used in a chemical reaction

• Potential energy

• The energy it takes to remove one electron from an atom or ion in its gaseous state

Multiple Choice

Explain why ionization energy decreases as you go down a group.

• Outer electrons are further away from the nucleus you go down a group

• Electrons feel less pull from the nucleus as you go down a group

• Electrons are easier to remove as you go down a group

• All of the above

Multiple Choice

Ionization energy __________ as you do across a period

• has no pattern

• stays the same

• decreases

• increases

Multiple Choice

Which has a lower ionization energy?

• Lithium

• Cesium

• Sodium

Multiple Choice

Which has the highest ionization energy?

• Arsenic

• Iron

• ZInc

• Cobalt

Electronegativity Trend

Electronegativity is a measure of an atom’s attraction for another atom’s electrons

Most Electronegative atom is Fluorine

Electronegativity Explanation

Open Ended

What does electronegativity mean?

Multiple Choice

What is the trend for electronegativity as you move left to right across a period and why?

• EN increases because the shielding effect increases causing the effective nuclear charge to decrease as you add more protons to the nucleus

• EN decreases because the shielding effect decreases causing the effective nuclear charge to increase as you add more protons to the nucleus

• EN increases because the effective nuclear charge increases as you add protons to the nucleus and increase the number of valence electrons in the outer shell

• EN decreases because the effective nuclear charge decreases as you reduce the number of protons in the nucleus and increase the number of valence electrons in the outer shell

Multiple Choice

What elements have zero electronegativity?

• metals
• nonmetals
• metalloids
• noble gases

Multiple Choice

Arrange the following elements in order by increasing electronegativity - Sn, Sr, I, Ag, Zr

• Sr, Zr, Ag, Sn, I

• Sr, Ag, Zr, I, Sn

• I, Sn, Ag, Zr, Sr

• Sn, I, Zr, Ag, Sr

Multiple Choice

Which element has the greatest electronegativity?

• Si

• S

• Ar

• Na

Multiple Choice

Which element has an electronegativity of 4.0, the highest of all elements?

• H

• Fr

• He

• F

Reactivity Trend

Multiple Choice

Metals that are the most reactive have the following characteristics

• small atomic radius, high ionization energy, high electronegativity

• large atomic radius, high ionization energy, low electronegativity

• large atomic radius, low ionization energy, low electronegativity

• small atomic radius, low ionization energy, low electronegativity

Multiple Choice

What is the most reactive metal?

• Li

• Be

• Fr

• H

Multiple Choice

What is the most reactive nonmetal?

• I

• F

• N

• At

Multiple Choice

The trend for reactivity for nonmetals is that as you move across from left the right reactivity __________(except for noble gases) and as you move down a group the reactivity _________

• increases, increases

• decreases, decreases

• decreases, increases

• increases, decreases

Multiple Choice

The trend for reactivity for metals is that the reactivity _______ as you go across the period and it _________ as you move down a group.

• increases, increases

• decreases, decreases

• does not change, decreases

• decreases, increases

Multiple Choice

Rank the following by increasing reactivity:

K, Mg, Na

• Mg, Na, K

• K, Mg, Na

• K, Na, Mg

• Na, Mg, K

Multiple Choice

Rank the following by increasing reactivity:

K, Mg, Na

• Mg, Na, K

• K, Mg, Na

• K, Na, Mg

• Na, Mg, K

Poll

How well do you feel like you understand the Periodic Trends?

• I feel great, like I could teach it myself

• I feel good

• I'm not so sure

• I really don't know what I'm doing and need to study