Page 223 - Science Course 1 (Book 1)

Mo6-L4b: How are Elements Arranged on the Periodic Table?

Mo6-L4b How are Elements Arranged on the Let’s Begin
Periodic Table?

KEY CONCEPTS: Today’s Periodic Table
1. What can you infer about the properties of two The table is organized into columns, rows, and
elements in the same group? blocks, which are based on certain patterns of
properties.

Vocabulary A-Z

Let us learn some vocabulary

Group

a column of the periodic table.
The element key shows an element’s chemical
symbol, atomic number, and atomic mass.

The key also contains a symbol that shows the state
of matter at room temperature.

Element Helium
Atomic number 2 State of Matter
He
Symbol
Mass 4.00
Period
a row on the periodic table.
H

Li Lithium
A group is a column on the
periodic table. Na Sodium

Elements in the same group K Potassium
have similar chemical
properties and react Rb Rubidium
with other elements in
similar ways. Cs Cesium

Fr Francium

I II Number of e-in III IV V VI VII VIII
A A Outer Shell(Group) A A A A A A
1 III IV V VI VII VII I II
2
Shell number period 3 B B B B B B B B

4
5
6
7

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