The Periodic Table (above) has 18 groups and 7 periods.
Metals, they are located on the left side of the periodic table and are really good conductors. They Are used for modern day tools.
Nonmetals, they are located on the right side of the periodic table and are usually not great conductors. They are usually used for gasses like oxygen.
Metalloids, located at the middle of the periodic table. They are all solid at room temperature, they are known as semi-conductors. They are mostly used for electronic devices.
A Proton (above) has a positive charge. (+) Located at the middle of the atom (nucleus).
A Electron (above) has a negative charge. (-) Located outside of the atom, in the electron cloud.
A Neutron (above) has no charge. (-+) Located in the middle of the atom (nucleolus)
The father of the periodic table.
The most reactive elements are Oxygen, Fluorine, Sodium, Rubidium, Francium, Barium, and Strontium. The most reactive elements are at the bottom of the table.
Least reactive elements are, Xenon, Neon, and Helium. Least reactive elements are located at the top of the table.
The Atomic Number represents the number of protons in the nucleus. The Symbol identifies the element. Atomic Mass represents the number of protons and neutrons. Mass Number represents the number of protons and neutrons in the nucleus.
Valence Electrons are electrons found on the outer most shell of an atom.
To find the number of electrons you subtract the atomic number from the atomic mass.
Physical Change- A change in a substance that does not change its identity
physical change- a change in a substance that does not change its identity
chemical change- a change in which one or more substance combined or break apart to form new substance
physical property- a characteristic of a pure substance that can be observed without changing it into another substance.
chemical property- a chemical of a pure substance that describes its ability to change into a different substance.
5 signs of unexpected chemical change:
Unexpected change of temperature
Formation of precipitant
Unexpected color change
Formation of bubbles