- Metals are like gold, sodium, or copper. Non-metals are brittle, not malleable or ductile. Metalloids are lustrous and not malleable or ductile. - Metals are commonly found on the left hand side of the periodic table. Non-metals are found on the right hand side, and Metalloids are found in between metals and non-metals. - Dmitri Mendeleev was the father of the Periodic Table. He invented it in 1869. -Caesium is the most reactive metal, and Flourine is the most reactive non-metal. Helium, neon, and argon are all less reactive elements. -There are 18 groups and 18 periods.
- each number tells us something different. whether its the atomic number, or the atomic mass. The atomic number tells us the number of protons in the element, the atomic mass tells us the mass of the atom. To find how many electrons are in an element you must Subtract the atomic number from the atomic mass.
a Valence Electron is an electron that is associated with an atom. They participate in the formation of a chemical bond; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair. 2,8,8,8,8 is the pattern for drawing an atom.
You should list the elements the same when balancing an equation that way you wont get them mixed up. he chemical formulas on the left represent the starting substances, called reactants. The substances produced by the reaction are shown on the right, and are called products.to balance an equation you should first Count the atoms of each element in the reactants and the products.
Use coefficients; place them in front of the compounds as needed.
the difference between chemical and physical properties is that a physical property can be observed with out changing into another substance. A chemical property describes its ability to change into a different substance. Chemical and physical property both never change and they are both independent. A Chemical CHANGE is any change that results in the formation of new chemical substances. While a physical CHANGE are changes affecting the form of a chemical substance, but not its chemical composition. both CHEMICAL AND PHYSICAL CHANGE are changes.. also they are both accompanied by energy changes.5 signs of chemical change are color change, formation of a precipitate, formation of a gas, odor change, and temperature change.