Chemistry Study Guide # 3

Models of the atom, PEN, Bohr models, Periodic Table and bonding

Match the model to the scientist

Democritus- matter is made up of atoms (from atomos meaning indivisible)

Dalton- atom is small ball

Thomson- atom is a positively charged sphere with electrons scattered in it

Rutherford- Atom is mostly open space with compact positive nucleus and

electrons randomly orbit around it

Bohr- electrons are arranged in energy levels

The 4 parts of the atomic theory according to _________ are

1.

2.

3.

4.

P.E.N.

          Name                             How it’s found              

P=

E=

N=

PEN diagrams are used to construct ___________________.

Ex Chlorine                                                           Bohr model

P=

E=

N=

Is Bohr’s model the correct representation of an atom?

Periodic Table

How did Mendeleev arrange the table?

What did he see when he arranged it this way?

How is the modern table arranged?

Where are nonmetals located?__________________________________.

Most reactive metals are found__________________________________.

Noble gases are in column ___________.

What is so special about the noble gases?

How are elements related in groups? How are they related in rows?

What do Lewis dot diagrams show?  When are they useful?

Bonding

Why do elements form bonds?

What part of an element is involved in bonding?

The maximum numbers of allowable electrons in an outermost energy level could be ________ or __________ if there is only one energy level.

The two main types of bonds are_________________ and ______________.

Ionic bonds form between _______________ and __________________ when  an atom either ___________ or _________________ an electron.

There are two types of covalent bonds ________________ and _________________.

What is the difference between the 2 types of bonds?