Atoms & Elements

4. Columns in the periodic table where elements have similar properties.
7. An ion with a positive charge.
9. The number of protons in the nucleus of an atom of an element.
10. Any of two or more versions of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic masses.
13. Found along the 'staircase'.Have properties of both metals and nonmetals.
14. A tiny, negatively charged particle that moves around the nucleus of an atom.
15. An element of the periodic table represented by the symbol Fe.
16. The total number of protons and neutrons in an atom's nucleus.
17. A chart of all chemical elements currently known, organized by their properties.
19. The first element in group 18 on the periodic table.

1. A subatomic particle that has no charge and that is found in the nucleus of an atom.
2. Positively charged particle in the nucleus of an atom.
3. The first element on the periodic table.
5. Horizontal row of elements in the periodic table.
6. Brittle, dull, poor conductors of hear and electricity, and have much lower melting and boiling points.
8. An ion with a negative charge.
9. The smallest unit of an element that maintains the properties of that element.
11. Pure substance that consists entirely of one type of atom.
12. Relating to or denoting electrons involved in or available for chemical bond formation.
18. Any atom or group of atoms that bears one or more positive or negative electrical charges.