Reference: Exploring Physical Science textbook, your notes, quizzes and study packs … a supplemental summary of the concepts… use text to add formulas and examples..
Note Bene : The “guiding relationship” used throughout the course: E=MC2 This relationship is the foundation of the laws of conservation of mass and the conservation of energy…. Mass (or energy) can not be created nor destroyed, only changed (transformed) in form. Use this relationship to guide your thinking as you consider the many ideas about various forms of matter and energy. Be familiar with the definitions of the terms used in this summary… …show more content…
The number of protons in the nucleus of an atom is called the atomic number of the element.
e. The forces that govern the behavior of subatomic particles are electromagnetic, strong, weak, and gravity.
f. The atom is the smallest piece of matter.
g. Atoms of different elements have different numbers of proton, neutrons and electrons.
h. The modern atomic model shows that an atome has a positively charged nucleus surrounded by a region in which there are enough electrons to make the atom neutral and are arranged in one or more energy levels.
6. Classification of Elements –The Periodic Table
a. The amount of energy needed to remove an electron from at atoms show a periodic increase from left to right across a period
b. The periodic law states that the physical and chemical properties of the elements are periodic functions of their atomic number.
c. Atomic size decrease as you move from left to right across a period.
d. The size of an atom and the number of its electrons determine the atom’s reactivity
e. The properties of elements in the same group, of family are similar to one another.
f. The number of valence electrons can be used to predict an element’s reactivity
g. Elements whose outer energy shell of electrons is full are inert – stable