Atoms, Quarks and Molecules
OH!!!!!! MY!!!!!
For my sweet Brittany and her Chemistry Friends!
• Sometimes in Chemistry the teacher forgets to tell you some of the most important concepts because they think you already know it
• This power point is to help organize the ideas of the basics of what atoms are and how they are organized
• Atoms are small particles that are made up of electrons, protons and neutrons
• Together the protons and neutrons create the nucleus
• The electrons travel around the nucleus
Just like the planets travel around the sun, electrons travel around the
nucleus• Atom • Planets around sun
Charges of Atoms
• Protons have a positive charge +
• Electrons have a negative charge -
• Neutrons have a neutral charge 0
Subatomic Particles
• Subatomic particles are a fancy name for the small particles that make up atoms.
For example: electrons, protons, neutrons
Size and Charge of subatomic particles
• The three particles are different in size and charge. Neutrons have no charge and are the largest subatomic particles. They are roughly the size of both a proton and an electron put together. Protons are slightly smaller than neutrons and have a positive (+) charge. Electrons are the smallest of all and carry a negative (-) charge.
That’s right!
• Protons = + Positive
• Electrons = - Negative
• Neutrons = 0 Neutral
In an atom(element) # protons = # electrons
If the # protons = # electrons
And protons are positive and electrons are negative
And Neutrons are neutral charge
An Atom or Element have a net neutral 0 Charge
• Electrons are white and negative
• Protons are yellow and positive
• Neutrons are orange and have no charge
Size of Atoms Particles
Protons and neutrons are about the same size.
Electrons are very very very small
The mass of the atom is mostly in the nucleus
Remember:
• The Nucleus is the protons and the neutrons together.
• The words Atoms and Elements mean the same thing
• The periodic chart is a chart that organizes the properties of atoms (elements)
The periodic chart can tell you a lot about the properties of the atom (element)
The Periodic Chart can tell you:
• How much the atom’s mass is• How many electrons an atom has• How many protons an atom has• How many neutrons an atom has
It can also tell you how reactive the atoms are to one another. This reactivity helps atoms to form with one another.
A periodic chart has two numbers on each element
• Atomic Number =
The number of protons and the number of electrons
• Atomic Mass =
What the mass of one mole of the element is equal to
(a mole is 6 x 10 to the 23rd atoms)
• # protons = Atomic #
• # electrons = Atomic #
• # neutrons = Atomic Mass – Atomic Number
Helium: Look at a periodic Chart
Atomic # = 2Atomic Mass = 4 (round it off)
# of protons = 2
# of electrons = 2
# of neutrons = 4 – 2 = 2
Barium: Look at a periodic Chart
Atomic Mass = 137
Atomic # = 56
# of protons = 56
# of electrons = 56
# of neutrons =
137- 56 = 81
Find the number of electrons, protons and neutrons for the following elements (atoms)
Atom # electrons # protons # neutrons
Hydrogen
Calcium
Carbon
Sodium
Chlorine
Nitrogen
Phosphate
Find the number of electrons, protons and neutrons for the following elements (atoms)
Atom # electrons # protons # neutrons
Hydrogen 1 1 0
Calcium 20 20 20
Carbon 6 6 6
Sodium 11 11 12
Chlorine 17 17 18
Nitrogen 7 7 7
Phosphate 15 15 16
A good interactive website that describes what atoms are built up
of• http://www.chemistryland.com/
ElementarySchool/BuildingBlocks/BuildingElements.html
• Click here to see atom website
This website is an interactive website that will teach you about finding # of electrons,
neutrons, protons
Website to learn number of protons neutrons and electrons
http://chemistry2.csudh.edu/lecture_help/protons.html
• Website to teach element reactivity
http://www.webelements.com/
• Demonstration of atoms forming a bond
http://faculty.ucc.edu/chemistry-pankuch/BaF2/BaF2.dcr
How to find number of electrons in orbitals
• Website to show number of electrons in orbitals
• http://education.jlab.org/qa/electron_number.htmlhttp://education.jlab.org/qa/electron_number.html