Science Puzzle

2. bond / formed when atoms share two pairs of electrons
3. / an idea to help the people to understand a concept that they cannot observe directly
5. / move around outside the nucleus of an atom
6. / elements in the same vertical column of the periodic table
7. bond / an attraction between a positive metal ion and the electrons surrounding it
9. / the center core of the atom
10. bond / the force that holds atoms together
13. ion / is made of more than one atom
14. / elements in the same horizontal row of the periodic table
15. / two or more substances that are mixed together but not chemical combined
18. bond / electrons are share unequally
19. / an neutral particle made of two or more atoms joined by covalent bonds
22. / tells you the ratio of elements in the compound
25. bond / share three pairs of electrons
27. bond / formed when two atoms share electrons
28. electrons / they are in the highest energy level
30. / the smallest particle of an element
31. / cannot be broken down into any other substance by chemical or physical means

1. / is called family
2. / material that can be pulled out into a long wire
3. / used to describe a material that can be hammered or rolled into shape
4. compound / compound that is composed of molecules
8. metal / element belonging to group 1 of the periodic table
9. bond / electrons are shared equally
11. / occupies space
12. theory / explains and connects wide range of observations
16. compound / consist of a positive and negative ions
17. gas / is found in the group 18 in the periodic table
20. / has the properties of a metal
21. / particles that are found in the nucleus of an atom
22. / used to identify an element
23. / an orderly three dimensional pattern of ions or atoms share electrons
24. / an atom or group of atoms that has become electrically charged
26. / an element belonging to group 17of the periodic table
29. number / protons in the nucleus of an atom
31. level / a region of an atom in which electrons of the same energy are likely to be found