Across
- 3. A sample of matter that retains its shape and density when not confined.
- 5. A subatomic particle that has no charge
- 7. A theory of atomic structure in which the hydrogen atom (Bohr atom).
- 8. The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- 11. Neutral subatomic particle that is a constituent of every atomic nucleus except hydrogen.
- 13. An arrangement of chemical elements based on the periodic law
- 15. The smallest particle of an element that can exist either alone or in combination
- 16. The smallest particle of a substance that retains all the properties of the substance and is composed of one or more atoms
- 19. A mass of a unit volume of a material substance
Down
- 1. A subatomic particle that has a negative charge.
- 2. A subatomic particle that has a positive charge.
- 4. The average mass of the atoms of an element measured in atomic mass unit.
- 6. A substance consisting of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule.
- 9. A measure of the amount of matter that an object contains.
- 10. The system of electrons surrounding the nucleus of an atom
- 12. Russian chemist who developed a periodic table of the chemical elements and predicted the discovery of several new elements.
- 14. A state of matter that has no fixed shape and no fixed volume.
- 17. A sample of matter that conforms to the shape of a container in which it's held.
- 18. one of the basic substances that are made of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances