science

2. the distance between the nucleus of an ion and the outermost shell of the ion.
4. atoms or radicals (groups of atoms), that have gained electrons.
8. the measure of the force of gravity on an object.
9. an electron that 'lives' in the last electron shell (or valence shell) of an atom.
13. atoms that have the same number of protons and electrons, but a different number of neutrons.
14. An elementary particle with a positive charge, found in the nucleus of an atom.
16. when metals stick together or form a bond.
17. atoms with extra electrons or missing electrons.
18. a number that is characteristic of a chemical element and represents the number of protons in the nucleus.
21. the ion in solution during electrolysis that travels to the cathode.
22. a dimensionless quantity representing the amount of matter in a particle or object.
25. the basic unit of a chemical element.
26. The tendency of an atom in a molecule to attract the shared pair of electrons towards itself.
28. a small egg-shaped structure inside the cell which acts like the brain of the cell.
29. the mass of a single atom of a chemical element.

1. the interatomic linkage that results from the sharing of an electron pair between two atoms.
3. How atoms stick together to form substances.
5. a chemical bond formed between ions of opposite charge.
6. a system for arranging the chemical elements
7. a group of elements in the periodic table.
10. a pure substance that is made from a single type of atom.
11. the particles in an atom that have a neutral charge.
12. an elementary particle that has a negative charge of electricity and travels around the nucleus of an atom.
15. the speed in a particular direction.
18. the shortest distance between the atom's nuclei and the outermost shell of the atom.
19. a measurement of mass in motion.
20. the smallest unit of a substance that has all the properties of that substance.
23. the measurement of change in an object's velocity.
24. a push or pull.
27. A bond formed between two atoms with a difference in electronegativities by sharing electrons.