Parts of an Atom

2. a small particle in the nucleus of the atom, with no electrical charge.
4. the average mass of one atom of an element.
7. the smallest component of an element having the same properties of the element
9. a substance of two or more elements chemically combined in a set ratio
12. a combination of two or more atoms that are bonded together
13. a charged atom, with more or less electrons than neutrons.
14. two or more elements that contains the same number of protons but different number of neutrons.
15. a tiny, negatively charged particle that moves around the nucleus of an atom.
17. a small, positively charged particle in the nucleus of the atom.

1. arrangement of chemical elements according to atomic number
3. the number of protons in the nucleus of an atom.
5. the set of characters that is used to identify an element
6. the electrons in the outermost electron level or orbital (highest energy level) of the electron.
8. the rows going across the periodic table
10. region of space around the nucleus where an electron is likely to be found
11. the central core of an atom containing protons and usually neutrons.
16. the columns going down the periodic table