atoms and elements

Atoms and Elements (science vocabulary)

1. atom -the smallest unit of an element that still has the properties of that element

2. proton- particle with a positive charge

3. electron -particle with a negative charge

4. neutron- particle with no charge

5. nucleus- the center of an atom (where the proton and neutrons are)

6. mass number- total number of protons and neutrons in an atom

7. atomic number- total number of protons in a nucleus

8. element- substance make of only one kind of atom

9. periodic table- table that shows the elements arranged by their atomic numbers

10.  molecule- two or more atoms bonded together

11. compound- a substance made of 2 or more different elements

12. matter- a substance that occupies space and has mass (all matter is made of atoms)

13.  solid- the state of matter that has a definite shape and volume

14.  liquid- the state of matter that has a definite volume but no definite shape

15. gas- the state of matter that does not have a definite shape or volume

16.   chemical property- a trait that involves the way a substance combines with other substances to form new substances  (reactivity, flammability, pH, toxicity)

17.  physical property- a trait that describes a substance (such as size, color, shape, hardness, texture, freezing/melting/boiling point)

18. mixture- a combination of two or more different substances

19. metal-a substance that transfers heat and electricity well and is malleable

20. nonmetal- a substance that does not transfer heat and electricity well and is not malleable

21. alloy-a solid solution in which metal or a nonmetal dissolves in metal

22. metalloid- a substance that has some of the properties of a metal and some of a nonmetal

23.  acid- a chemical compound that has a ph less than 7, it turns blue litmus paper red

24.  base- a chemical compound that has a ph more than 7, it turns red litmus paper blue

Wednesday  2/10- write definitions           

Thursday   2/11- Atoms and Elements worksheet (on the back of the crossword)            

Tuesday 2/12- crossword  and study (atoms and elements quiz on Wed. 2/13)