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ch. 18:prop. of atom
Question | Answer |
---|---|
The smalles piece of matter that still retains the property of the element | atom |
positively charged center of an atom that contains protons and neutrons | necleus |
negatively charged particles surroudning the center of an atom | Electron |
particles with a postive charge | Protons |
area around the nucleus where electrons are most likely found | electron cloud |
small particles that make up protons and nuetrons. | quarks |
number of protons in an atom | atomic number |
the sum of the number of protons and neutrons in the nucleus. | mass number |
atoms of the same element that have different numbers of neutrons | isotopes |
an element is the weighted average mass of the mixture of it's isotopes | average atomic mass |
elements are arranged by increasing atomic number and by changes in physical and chemical properties | periodic table |
vertical columns in the periodic table | groups |
uses the symbol of the element and dots to represent the electrons in the outer energy level | electron dot diagram |
horizontal row of elements on the periodic table | periods |
neutral particles that do not have an electrical charge | neutrons |