Phys Sci 3-7

Happy

Halloween!

AWESOME WORDS

chemical symbol - shortened way of writing the

name of the chemical

periodic - repeatingpattern
group - verticalcolumnof elements in the
periodic table
period - horizontal row of elements in the
periodic table

Shortened names

01

Multiple Choice

The first letter of a chemical symbol is capitalized. true or false

• true

• false

● a new system was created to

represent all elements

● it is a shortened way of

writing the names

● they are called chemical

symbols

Multiple Choice

A chemical symbol is a

• a repeating pattern

• a vertical column

• shortened way of writing the name of an element

• a horizontal row

Chemical symbols

02

● they are created from the name of the element

● they are usually 1 or 2 letters

○ if there are 2 letters:

■ first letter is capital

■ second letter is lowercase

● some chemical symbols have 3 letters

○ this is temporary

Example: Au is

the element

gold

some symbols come

from Latin or

Anglo-Saxon words

Arranging
elements

03

Dmitri Mendeleev,
“father of periodic

table”

● by 1800’s, scientist needed a way to organize

● Dmitri Mendeleev- listed in order of increasing

atomic mass

● he noticed elements with similar properties

occurred periodically= a pattern

○ so he arranged in rows

○ elements with similar properties were in the

same column

04

Modern
Periodic
Table

● Mendeleev’s table did have problems

● discovery of atomic numbers led to a new table

● elements were arranged in order of increasing

atomic number= so all elements in the same

column had similar properties

○ the modern periodic table of elements

Multiple Choice

Elements modern periodic table are arranged by increasing

• atomic number

• rows

• columns

• atomic mass

05

Groups and periods

● 18 column called groups or families

○ these elements have similar chemical and physical

properties

○ they have the same number of electrons (in their

outermost energy level)

Multiple Choice

Which is not true about groups

• they have similar chemical properties

• they have different physical properties

• they have the same number of energy levels

• they are arranged in columns

● 7 rows called period

○ do not have similar properties

○ each period starts with an element that is solid

○ ends with an element that is a gas

○ same number of energy levels

○ the first period does not follow this rule

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