ATOMIC STRUCTURE

Notes are for your personal use. Abbreviate as you see fit.

Atomic Structure

Atoms are the ____________ of matter, or building blocks to make all solids, liquids & gases

Atoms can be broken down into ____________ of SUBATOMIC PARTICLES

SUBATOMIC PARTICLES

1. ______________ = positive electrical charge, found in the NUCLEUS, or center of an atom

2. _______________= neutral (no electrical charge), also found in the NUCLEUS

SUBATOMIC PARTICLES

3. ______________= negative electrical charge, found moving around the nucleus in the ELECTRON CLOUD

Atomic Structure

Atomic Structure

Electrons like to travel _______, when they can find another electron to travel with.

Different layers within the electron cloud are called ________________ or SHELLS

Atomic Structure

ENERGY LEVELS or ________ hold different amounts of electrons

There are exceptions to the rule, but the basic idea is:

Atomic Structure

Level 1 holds _______ electrons

Level 2 holds _______ electrons

Atomic Structure

Level 3 holds _______ electrons

Level 4 holds _______ electrons

Draw an atom with 4 energy levels

How to find atomic structure

Check the PERIODIC TABLE OF ELEMENTS

Created by _____________ in 1869

Page 134-135 in your text

How to find atomic structure

ATOMIC NUMBER = __________________ in the nucleus

Each different atomic number is a new _______________, or pure substance that cannot be broken down

How to find atomic structure

ATOMIC MASS = __________ PLUS ________ in the nucleus

Neutrons ____________ to an atom, making some elements “heavy” or “light”

How to find atomic structure

Atomic Mass- ___________ = # of ____________

Neutrons usually __________ as the atomic number increases. This means as atoms hold more protons, they usually hold more neutrons too!

How to find atomic structure

To find the number of electrons in an atom, check the atomic number.

For every _________, an atom will have a __________

THE END