Happy Atoms Worksheet Page 8
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33Periodic Trends Lesson Guide
Big Idea
The periodic table is organized in rows by increasing atomic number, such that elements
with similar atomic structure and chemical properties are grouped as vertical columns.
Increasing or decreasing trends, such as atomic size, number of valence electrons, or
electronegativity, can be observed in the periodic table across a period or down a group.
Learning Objectives
Students will be able to:
1. Understand how atomic size changes down a group by visually drawing the trend
when provided with a blank periodic table.
2. Understand that elements within the same group have similar chemical properties
and atomic structure, and demonstrate that understanding by identifying that
elements with the same number of valence electrons also reside in the same group.
3. Understand that elements from different groups have different chemical properties
and atomic structure by identifying the difference in the number of valence
electrons across a period in the periodic table.
Standards Addressed
1. Use the periodic table as a model to predict the relative properties of elements based on
the patterns of electrons in the outermost energy level of atoms. (HS-PS1-1.)
2. Construct and revise an explanation for the outcome of a simple chemical reaction
based on the outermost electron states of atoms, trends in the periodic table, and
knowledge of the patterns of chemical properties. (HS-PS1-2.
3. Science and Engineering Practice: Developing and using models
4. Crosscutting Concept: Structure and Function
Vocabulary, Content and Misconceptions
Group
Period
Atomic size
Atomic size across a period is not well represented in the Happy Atoms set and app.
Students often don’t understand that the Noble Gases are larger compared to the Halogens
because atomic size generally decreases as you move from left to right in a period.
Students sometimes think it is a mistake in their book or ask if this is a mistake in the
models. A discussion of the properties of Noble Gases and the Octet rule would help with
this. Noble gases have a complete outer shell of electrons. The size of each atom is larger
because there is more electron repulsion. Because Noble Gases have all the valence
electrons they need, they are very stable and don’t participate in many chemical reactions.
The models can be used to discuss the misconception that the valence electrons do not
represent all the electrons of an atom. You can note that the noble gases do not have any
valence electrons: it might seem like it would be just a free floating nucleus, but rather they
have full octet of electrons. Use this to guide students, along with the use of the Happy
Atoms application, to show that the magnets are just showing the valence electrons and not
the total number of electrons in an atom.
1
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education