Structure of the Atom
What is the mass of a electron?
0.005 atomic mass units or 1/2000 a.m.u.
What is the mass of a neutron?
1 atomic mass unit
What is the mass of a proton?
1 atomic mass unit
How many electrons can fit in the first energy level?
2 electrons
Periodic Table of the Elements
A chart that shows 118 different types of atoms. 92 of the elements are naturally occurring.
electron
A negatively charged subatomic particle located outside of the nucleus. Mass is 0.005 a.m.u. or 1/2000 a.m.u.
neutron
A subatomic particle located in the nucleus that has no charge. Mass is 1 a.m.u.
Energy Levels
Areas around the outside of the nucleus where electrons are located. There are up to 7 rings.
How would you calculate the neutrons in an atom?
Atomic mass minus the atomic number.
How do you determine the number of protons in an atom?
Atomic number equal the proton number.
How do you determine the number of electrons in a neutral atom?
Electron number equals proton number in a neutral atom. Proton number equals the atomic number. Therefore, electron number can be determined by looking up the atomic number for the element on the periodic table.
What is the electrically charge of a electron?
Has a negative charge.
What is the electrical charge of proton?
Has a positive charged
What is the electrically charge of a neutron?
Has no charge.
Electron Cloud
Located outside of the nucleus. Electron are located here.
Where are neutrons located in the atom?
Nucleus
Where are protons located in an atom?
Nucleus
Where are electrons located in the atom?
Outside the nucleus in the electron cloud
Proton
Positively charged subatomic particle located in the nucleus of the atom. Mass is 1 a.m.u.
Atom
The basic building block of matter.
Element
The basic unit of matter that consists of one type of atom.
Nucleus of the Atom
The center of the atom. Location of protons and neutrons.
Valence electrons
The electrons that are in the outermost shell in the electron cloud. It is these electrons that form the chemical bonds between atoms in compounds.
Atomic Mass
The mass of the protons and neutrons in an atom.
Atomic Number
The number of protons in the nucleus of the atom.
Subatomic particles
Three particles: protons, neutrons, electrons
Matter
anything that has mass and takes up space.
Which energy level is filled first?
first ring (orbital, shell) nearest the nucleus.
How many electrons can fit in the third energy level?
up to 18 electrons
How many electrons can fit in the fourth, fifth, sixth, seventh energy level?
up to 32 electrons
How many electrons can fit in the second energy level?
up to 8 electrons
