1. Matter, Atoms and the Periodic Table

2.  There are more than 100 of these that combine in a multitude of ways that make up all of the living and nonliving things that we encounter. elements

3. atoms  Matter is composed of extremely small particles, too small to be seen with a classroom microscope, called…

4. Same; same  Complete the following sentence with either ‘same’ or ‘different’:  “All atoms in a piece of pure copper have _______ atomic number and _______ numbers of electrons.”

5. 17 protons  Use the Periodic Table to help you answer this question:  In a sample of the element chlorine, each atom has ◦ 17 protons ◦ 20 neutrons ◦ 39 protons and neutrons ◦ 35 neutrons

6. Protons only  The atomic number of any atom is equal to the number of: ◦ Neutrons in the atom, only ◦ Protons in the atom, only ◦ Neutrons plus protons in the atom ◦ Protons plus electrons in the atom

7. Ca  Use the periodic table to help you answer this question:  What is the symbol for an atom containing 20 protons? ◦ Ca ◦ C ◦ Ne ◦ Fl

8. Protons and electrons  Atoms always have equal numbers of ◦ Protons and neutrons ◦ Electrons and neutrons ◦ Protons and electrons

9. It has a smaller mass than a proton and a negative charge  Which statement is true about an electron? ◦ It has a smaller mass than a proton and a negative charge. ◦ It has a smaller mass than a proton and a positive charge. ◦ It has a greater mass than a proton and a negative charge. ◦ It has a greater mass than a proton and a positive charge.

10. Argon (Ar)  Use the periodic table to help you answer this question:  Which atom has the largest number of protons? ◦ Al (aluminum) ◦ Ar (argon) ◦ Si (silicon) ◦ Na (sodium)

11. 27  Use the periodic table to help you answer this question:  How many electrons are there in an atom of Co? ◦ 27 ◦ 32 ◦ 39 ◦ 86

12. They are the building blocks for all matter  Which statement about atoms is true? ◦ They are the building blocks for all matter. ◦ They are easily seen with the naked eye. ◦ They do not contain protons.

13. I (Iodine)  Which element is a member of the halogen family? ◦ K ◦ B ◦ I ◦ S

14. Protons and neutrons  Which subatomic particles make up most of the mass of the atom? ◦ Protons and neutrons ◦ Protons and electrons ◦ Neutrons and electrons ◦ Neutrons and positrons

15. Number of protons  The total number of electrons in an atom of any element is always equal to the atom’s: ◦ Mass number ◦ Number of neutrons ◦ Number of protons

16. phosphorus  Which atom contains 15 protons? ◦ Phosphorus ◦ Sulfur ◦ Oxygen ◦ Nitrogen

17. 5  An atom with 5 protons and 6 neutrons has an atomic number of: ◦ 5 ◦ 6 ◦ 8 ◦ 11

18. 62  What is the atomic mass of an atom with 28 protons, 28 electrons, and 34 neutrons? ◦ 28 ◦ 56 ◦ 62 ◦ 90

19. atoms  All matter is made up of: ◦ Atoms ◦ Molecules ◦ Cells ◦ Compounds

20. Iron (Fe)  Which of the following is made of atoms that all have the same atomic number? ◦ Iron (Fe) ◦ Carbon dioxide (CO₂) ◦ Water (H₂O) ◦ Sodium chloride (NaCl)