Ionization Energy
Atomic Radius
Electronegativity
Metals, Nonmetals, Metalloids
Groups
Octet, Schmoctet
100

What are the three periodic trends to know about?

Atomic Radius, Ionization Energy, and Electronegativity

100

What is atomic radius?

It is half the distance between two adjacent nuclei of atoms of the same element. 

100

What does electronegativity tell us about?

Electronegativity tells us how strongly an atom holds onto/attracts electrons to itself. 

100

Good conductor of electricity and shiny.

Give an example.

Metal.

Anything to the left of the staircase is a metal. 

100

Name for elements in Group 1 on periodic table. 

Alkali metals

100

How many valence electrons are in calcium?

2

200

What is ionization energy?

The energy required to remove a valence electron. 

200

What is the periodic trend in atomic radius?

Increases from top to bottom within a group, decreases from left to right within a period. 

200

What is the periodic trend in electronegativity?

It decreases from top to bottom within a group, and it increases from left to right within a period.  

200

What are the general characteristics of metalloids?  

  • Share properties of both metals and nonmetals

200

Name for elements in group 2 on the periodic table. 

Alkaline Earth metals

200

How many valence electrons are in bromine?

7

300

Describe the periodic trend of Ionization energy 

Decreases from top to bottom within a group, increases from left to right within a period. 

300

How many energy levels does gallium have?

4

300

Order the following elements in increasing electronegativity: 

C, Si, Ge, Sn, and Pb.

Pb<Sn<Ge<Si<C

300

Poor conductors of electricity and not shiny, not malleable, not ductile. 

Nonmetals. 

300

What is the name for the group of elements in Group18 of the Periodic Table? 

Noble Gases.

  • Unreactive

300

What type of bond will form between silicon and oxygen?

covalent

400

If it's easy to remove an electron, is ionization energy low, or high?

Low

400

How many energy levels does cerium have?

6

400

Use what you know about periodic trends to determine which of the following is ordered correctly from least to most electronegative.

a) F, Cl, Ge, Sn 

b) Rb, Ca, Sc, Cs 

c) Zr, V, Nb, Ta 

d) Sn, As, P, S 

e) Li, Na, K, F

d)

400

Give an example of a metalloid

Boron, silicon, germanium, arsenic, antimony, tellurium, polonium

400

These elements are extremely toxic and have 7 valence electrons.

Halogens.

400

What are the exceptions to the octet rule?

Hydrogen and boron

500

Explain why we observe the periodic trends in ionization energy.  

It decreases from top to bottom within a group because energy levels are added, which increases the distance between the valence electrons and the nuclear pull.  There are also more core electrons to shield the pull from the nucleus, which makes it easier to remove electrons, making ionization energy decrease.  

It increases across a period, because nuclear charge increases without adding energy levels, so that increases the attraction for electrons and makes them harder to remove, which increases ionization energy.

500

Explain why we observe the periodic trends in atomic radius.  

It increases from top to bottom within a group because energy levels are added, which increases the distance between the valence electrons and the nucleus. 

It decreases across a period, because nuclear charge increases without adding energy levels, so that increases the attraction for electrons which pulls them in and makes the atom smaller. 

500

Explain why we observe the periodic trends in electronegativity. 

It decreases from top to bottom within a group because energy levels are added, which increases the distance between the valence electrons and the nuclear pull.  There are also more core electrons to shield the pull from the nucleus, which reduces its ability to attract electrons, making electronegativity decrease.  

It increases across a period, because nuclear charge increases without adding energy levels, so that increases the attraction for electrons, thus increasing electronegativity. 

500

What's the difference between a group and a period?  What information can we get from them? 

Groups are the vertical columns on the periodic table, periods are the horizontal rows. 

Groups tell us the number of valence electrons, periods tell us how many energy levels are used to arrange the electrons. 

500

Why are noble gases chemically stable?

They have an octet. 

500

How many electrons do the exceptions to the octet rule need for stability?

Hydrogen:  2

Boron:  6

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