Choice bored

6. Horizontal row in the periodic table.
7. Vertical row in the periodic table.
8. Element that typically is a hard, shiny solid, is malleable, and is a good conductor of heat and electricity.
11. A phase that has a definite volume but takes the shape of its container.
13. A minute portion of matter.
14. The number of protons in an atom's nucleus.
15. Amount of matter in an object.
17. A force that holds atoms together in a compound.
18. A phase that does not have a definite shape or volume.

1. The smallest particle of an element that still retains the properties of the element.
2. Particle located inside the nucleus of an atom that has positive charge.
3. Mass per unit volume of a material.
4. A measure of the average kinetic energy of all the particles in an object.
5. Positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons.
9. Element that shares some properties with metals and some with nonmetals.
10. The number of protons and neutrons found in the nucleus.
12. Substance with atoms that are all alike.
16. Group of elements with similar chemical properties.