periodic table

Edit Answers
12345678
Across
  1. 3. the number of protons in the nucleus of an atom and uniquely identifies a chemical element.
  2. 6. a one- or two-letter abbreviation used to represent a chemical element
  3. 8. the shell that orbits the outside of the nucleus
Down
  1. 1. a characteristic of matter that can be observed or measured without changing the substance's chemical identity
  2. 2. a chart that organizes the chemical elements into rows called periods and columns called groups, based on their atomic number and recurring chemical properties
  3. 4. the total count of protons and neutrons in an atom's nucleus, calculated by adding the number of protons and neutrons together
  4. 5. an atom or group of atoms that has a net electrical charge because it has gained or lost one or more electrons.
  5. 7. aof more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms.