Chemistry Unit 2

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Across
  1. 3. A tiny unit of matter such as an atom. Make up the building blocks of everything.
  2. 5. Smallest units of a compound that retain the chemical properties of that compound. Made up of atoms bonded together.
  3. 9. The amount of matter in an object. The total amount of molecules and atoms in an object.
  4. 10. A subatomic particle found in the nucleus of an atom. No electrical charge, contributes to the mass of the atom.
  5. 12. A unit used to measure the amount of a substance. Can be compared to saying a dozen =12.
  6. 13. table Arrangement of chemical elements, organized based on atomic number, electron configuration, and chemical properties.
  7. 14. A combination of symbols that represent the composition of a compound or molecule. Numbers present in a substance.
  8. 18. A substance that can't be broken down into simpler substances by chemical means.On the periodic table.
  9. 19. Used to measure different properties. Can be used by grams, mol, etc.
Down
  1. 1. A simple representation of an element. It is used to identify or refer to specific elements in chemical formulas and equations.
  2. 2. composition Way to express the relative amounts of different elements in a compound. Percentage of each element's mass in the total mass of the compound.
  3. 4. A substance made up of 2 or more elements chemically combined together. Has its own unique properties.
  4. 6. A subatomic particle found outside the nucleus, with a negative charge.
  5. 7. Electrical property of an atom or molecule. Can be positive or negative.
  6. 8. formula The simplest ratio of elements in a compound. Shows the relative number of atoms of each element present in a compound.
  7. 11. A subatomic particle found in the nucleus, with a positive charge. Contributes to the mass and atomic number of the atom.
  8. 15. formula Represents the actual number of atoms of each element in a molecule. Exact composition of a compound.
  9. 16. Basic unit of matter. Made up of protons neutrons and electrons.
  10. 17. A charged particle that forms when an atom gains or loses electrons. Can be positively or negatively charged.
  11. 20. A variation of an element with the same number of protons but a different number in neutrons.Different atomic masses but same original element.