Physical Science Unit 7 Vocab

1. a visual model of the most likely locations for the electrons in an atom
2. a neutral subatomic particle that is found in the nucleus of an atom
7. a unique number for each element that equals the number of protons in an atom of that element
8. the arrangement of electrons in the orbitals of an atom
13. an arrangement of elements in columns, based on a set of properties that repeat from row to row
16. the elements in Group 7A of the periodic table
18. elements that are poor conductors of heat and electric current
20. the elements in Group 2A of the periodic table
22. a positively charged subatomic particle that is found in the nucleus of an atom
24. the elements in Group 1A of the periodic table, not including hydrogen
26. the sum of the number of protons and neutrons in the nucleus of an atom

1. the possible energies that electrons in an atom can have
3. the elements in Group 8A of the periodic table
4. a negatively charged subatomic particle that is found in the space outside the nucleus of an atom
5. a region of space around the nucleus where an electron is likely to be found
6. an electron tat is in the highest occupied energy level of an atom
9. a state I which all the electrons in an atom have the lowest possible energies
10. the dense, positively charges mass located in the center of an atom
11. atoms of a given element that have different numbers of neutrons and different mass numbers
12. elements that form a bridge between elements on the left and right sides of the periodic table
14. a column of elements in the periodic table
15. the pattern of repeating properties displayed by elements I the periodic table
17. one twelfth the mass of a carbon-12 atom
19. elements that are good conductors of heat and electric current
21. elements with properties that fall between those of metals and nonmetals
23. a row in a periodic table of elements
25. atomic mass unit