Chemistry Lizabeth santamaria & Marcos Sanchez blanco

PERIODIC TABLE

  • metals- are found left of the stair case
  • nonmetals- are found right of the stair case
  • metalliods- are the stair case
protons- are positive & neutrons- are neutral & Electrons- are negative
the father of the periodic table is Dmitri-Mendeleev
the most reactive element is francium
the most stable element is helium
their are 18 groups and their are 7 periods in the periodic table.
Group 1: Alkali metals Group 2: Alkali Earth metals Group 3: Rare Earth Group 11: Coinage metals Group 15: Pnictogens Group 16: Chalcogen Group 17: Halogens Group 18: Noble gases
ATOMIC NUMBER, ATOMIC MASS, MASS NUMBER each number tells us the atomic number,the mass and the number of protons and neutrons.
~atomic number= the # of proton and electrons ~atomic mass= the weight of the element. ~you can tell the number of elections by looking at the atomic number
a valence electron is an electron that is associated with an atom, and that can 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.

chemical & physical properties & changes

a physical change unlike chemical change only changes the physical appearance. While a Chemical change is a change chemically. They both change a substances. a characteristic of a pure substance that describes its ability to change into a different substance. a characteristic of a pure substance that can be observed without changing it into another substance. They are both used to classify substances 5 signs of chemical changes are Fire,gas, Change in color, change in temperature, formation of a precipitate.

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