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(5) Matter and energy. The student knows that matter is composed of atoms and has chemical and physical properties. The student is expected to:
(A) describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons in the nucleus and electrons in the electron cloud;
(B) identify that protons determine an element's identity and valence electrons determine its chemical properties, including reactivity;
(C) interpret the arrangement of the Periodic Table, including groups and periods, to explain how properties are used to classify elements;
Vocabulary
Vocabulary
Protons - positively (+) charged subatomic particle located in the nucleus of an atom, weighs 1 AMU
Neutrons - neutral (no charge) subatomic particle located in the nucleus of an atom, weighs 1 AMU
Electrons - negatively (-) charged subatomic particle located in specific energy levels of the electron cloud surrounding the nucleus of an atom
Electron cloud - area around the nucleus of an atom where electrons are most likely to be found in orbit on specific energy levels
Nucleus - small, positively (+) charged, very dense center of an atom that contains most of the weight of the atom
Valence electrons - electrons located on the outermost energy level of the electron cloud that determine the chemical properties of the element
Chemical Properties
Reactivity
Blendspace: Decoding Models
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