Chem Test 1: Ch 3 Word Scramble
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Question | Answer |
Alkali Metal | Group 1 A, soft shiny with one valance electron (exclude Hydrogen) |
Alkaline Earth Metals | Group 2A, 2 valence electrons |
Atom | Smallest particle of element that retains its characteristics |
Atomic Mass | weighted average mass of all isotopes |
Amu | Atomic mass unit, used to measure atoms and subatomic particles |
Atomic Number | Number of protons in an atom |
Compound | Pure substance containing 2 or more elements, can be broken down by chemical process |
Electron | Negatively charged particle, basically no mass, e- |
Element | Pure substance that cannot be broken down by a chemical process |
Energy Level | Group of electrons with similar energies |
Group | Vertical Column, contains elements with similar physical and chemical properties |
Group Number | Top of each group, indicates number of valence electrons |
Halogens | Group 7A |
Heterogeneous Mixture | Mixture that is not uniform |
Homogeneous Mixture | Mixture that is uniform |
Ionization Energy | Energy needed to remove least tightly bonded valence electron |
Isotope | Atom with different mass number, same atomic number, but different physical properties |
Mass Number | Total number of neutrons and protons in atom |
Metal | Left side of periodic table, shiny, malleable, ductile, good conductor of heat and electricity |
Metalloid | on zigzag line, properties of metals and non metals |
Mixture | physical combination of 2 or more substances that don’t change their identities |
Neutron | Mass: 1 amu, in nucleus, symbol: n |
Noble Gas | Group 8A, generally un reactive and seldom combined with others |
Nonmetal | Right side of periodic table, little or no luster, poor conductor |
Nucleus | center of atom contains proton and neutron |
Orbital | region around nucleus where electrons are found |
Period | horizontal row of elements |
Physical Properties | characteristics that can be observed or measured |
Proton | mass: 1 amu, in nucleus, symbol: p or p+ |
Pure substance | matter with fixed composition: elements and compounds |
Valence Electrons | Electrons in outermost energy level of atom |
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kallenpoole
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