Chemistry

• matter is anything that occupies space and has mass
• mass is the total amount of matter in an object
• weight is the amount of matter in relation with gravity
• volume is the amount of space in an object
• impenetrable property states that no two objects can occupy space at the same time
• density is how much compact the object is
• gas has indefinite volume
• solid have definite shape
• atomic theory states that matter is comprised of atoms
• atoms are the bulding blocks that make up matter
• atomos means indivisible in greek
• atoms can be protons, electrons, neutrons
• the middle part of atoms is nucleus
• the nucleus has the neutron and protons
• electrons surrounds the nucleus of an atom
• atomic number conveys protons
• the latest atomic model is schrodinger's quantumn model
• the billiard ball model of atoms is theorized by john dalton
• the plum pudding model is theorized by jj thomson
• the planetary model of an atom is theorized by niels bohr
• the nuclear model of an atom is theorized by earnest rutherford
• the quantumn model of an atom is theorized by schrodinger
• the billiard ball model states that atoms are hard and round
• the plum pudding model states that atoms are surrounded by negatively charged particles in the middle of a positively charged nucleus
• the nuclear model states that atoms mass is concentrated in the nucleus
• the nuclear model states that atoms are the energy of electrons are based from their position/ distance to the nucleus
• the quantumn model states that electrons are waves in orbitals
• pure substances are forms of matter with constant composition
• elements and compounds are pure substances
• elements and compounds have fixed composition
• elements are the simplest forms of matter
• there are currently 118 elements in the periodic table
• the periodic table is invented by dimitri mendeleev
• the common element in the universe is hydrogen
• the most element is hydrogen
• the most abundant element on earth is oxygen
• the second most common element in the universe is helium
• technetium is the 1st man made element
• ion are charges atoms
• anions are negatively charges atoms