Download Element: pure substances that are made up of one kind of atom

Element: pure substances that are made up of one kind of atom. Elements are abbreviated in scientific shorthand.
They are written with either one capital letter, or a capital letter and a lowercase letter. These abbreviations are called a
chemical symbol. Ex: Aluminum= Al Copper= Cu
Pizza is not an element because it is a mixture of many substances. Water is a pure substance, but it contains
two kinds of atom: oxygen and hydrogen. Iron is an element because it is composed of one kind of atom.
Atom: the smallest piece of matter that still has the properties of the
element. Atoms are made of smaller pieces called subatomic particles.
Proton: positively charged subatomic particle
Neutron: neutral subatomic particle
Electron: negatively charged subatomic particle
Nucleus: located at the center of the atom. Consists of protons and
neutrons. Electrons surround the nucleus.
Electron Cloud: the current model of an atom contains an electron
cloud that shows electrons traveling in specific energy levels around
a nucleus. The farther away from the nucleus an electron is, the
more energy it has.
Electrons in Energy Levels
Energy Level in Atom
Maximum Number of Electrons
1
2
2
8
3
18
4
32
1. _______________What part of the atom has no charge?
2. _______________What part of the atom has a positive charge?
3. _______________What part of the atom has a negative charge?
4. _____________How many electrons can be held in the first orbital (closest to the nucleus)?
5. _______________How many electrons can be held in the second orbital?
6. _______________How many electrons can be held in the third orbital?
7. _______________There are the same number of these two particles in an atom.
8. _______________The atomic number is the same as the number of these particles.
9. _______________The mass number is determined by which particles?
1. How many protons does the atom
have?
2. How many neutrons does the atom
have?
3. How many electrons does the atom
have?
4. What is the atomic number of the
atom?
5. What is the mass number of the atom?