1. Objective On a note card or ½ sheet of paper please write the following which you will give me as your exit ticket Objective: name the parts of an atom?Objective: name the parts of an atom?

2. Matter and Atoms All matter is made of atoms!!! Atom: the smallest unit of an element that maintains the properties of that element. Atoms are so tiny scientists need a very powerful microscope to see them!

3. Atoms As tiny as an atom is, it is made up of even smaller particles. Protons Neutrons Electrons 2 parts of an atom Nucleus and Electron Cloud!

4. The Nucleus Protons are positively charged particles in the nucleus.Protons are positively charged particles in the nucleus. Neutrons are the particles of the nucleus that have no electrical charge.Neutrons are the particles of the nucleus that have no electrical charge.

5. Outside the Nucleus Electrons are the negatively charged particles in atoms.Electrons are the negatively charged particles in atoms. Electrons are found around the nucleus within electron clouds.Electrons are found around the nucleus within electron clouds. Atomic Number the number of protons in the nucleus. An atom has the same number of protons as electrons.Atomic Number the number of protons in the nucleus. An atom has the same number of protons as electrons.

6. Picture of an Atom Electron cloud nucleus

7. Ions Its what an atom is called when there protons and electrons are not equal. An atom that loses one or more electrons is called a Positively Charged Ion. An atom that gains one or more electrons it is called a Negatively Charged Ion.

8. Atomic Number There are more than 110 different elements/atoms. Atomic Number:The number of protons in the nucleus of an atom: the atomic number is the same for all atoms of an element. Carbon has 6 protons in its nucleus, so its atomic number is 6.

9. How do Atoms differ? Atoms make up individual elements. By changing the number of protons in the atom, you change the type of element.Atoms make up individual elements. By changing the number of protons in the atom, you change the type of element. For example: The hydrogen atom has 1 proton and 1 electron.For example: The hydrogen atom has 1 proton and 1 electron. The helium atom has 2 protons, 2 neutrons, and 2 electrons.The helium atom has 2 protons, 2 neutrons, and 2 electrons. For bigger atoms, simply add protons, neutrons, and electrons.For bigger atoms, simply add protons, neutrons, and electrons.

10. Isotopes Isotopes are atoms that have the same number of protons but have different numbers of neutrons.Isotopes are atoms that have the same number of protons but have different numbers of neutrons. You can identify each isotope of an element by its mass number. The mass number is the sum of the protons and neutrons in an atom.You can identify each isotope of an element by its mass number. The mass number is the sum of the protons and neutrons in an atom.

11. Atomic Mass Most elements contain a mixture or two or more isotopes. The Atomic Mass: of an element is the weighted average of the masses of all the naturally occurring isotopes of that element.

12. How to find A.M. Multiply the mass numbers of each isotope by its percentage in decimal format. So you have Chlorine-35 at 76% and Chlorine-37 at 24%. (35X0.76)=26.60 (37X0.24)=8.88 Then add the two answers together 26.60 + 8.88=35.48 amu