Study Guide – Periodic Table Name______Per_____
1. Who was Dmitri Mendeleev? What is his importance to the periodic table? Created the first Periodic Table. Organized elements by atomic mass. Predicted properties of undiscovered elements.
Use this blank periodic table to answer 2, 3, & 4
2. Label group numbers. What is true about elements in the same group? Groups are columns and are numbered 1 – 18. Elements in the same group share similar chemical properties because they have the same number of valence electrons – (electrons in outermost energy level). 3. Label period numbers. What do the period numbers tell you? Rows are periods and are numbered 1 – 7. Elements in same period have the same number of energy levels. They do not share properties. 4. Label metals, nonmetals, and metalloids.
5. Which share more characteristics in common, group members or period members? Group members
6. Name the groups & identify the characteristics of each group:
See PowerPoint on Website slides 39-54. https://teacher.portal.mckinneyisd.net/105040_/Pages/Default.aspx
group 1 Alkali Metals – extremely reactive. group 2 Alkali Earth Metals groups 3-12 Transition metals – metals most people are familiar with group 17 Halogens – extremely reactive group 18 Noble gases – completely NON-reactive because the have a complete outer energy level.. Also referred to as inert gases.
7. What does the 2-8-8 rule tell us? Only 2 electrons in first energy level. 8 in the 2nd. 8 in the 3rd.
8. What properties do metals share? shiny, gray/silver color, good conductors of electricity & heat, malleable, react with acid, give up electrons in chemical reactions, some are magnetic
9. What properties do nonmetals share? dull, earth tone colors, poor conductors of heat & electricity, brittle, do not react with acids, never magnetic, steal electrons in chemical reactions
10. The center of the atom is called the neutron. It consists of protons & neutrons. It is surrounded by energy levels that hold the negatively charged electrons.
A. B. C.
11. Name the elements above. Sodium (Na), Lithium (Li), Carbon (C)
12. How do you know which if one is a metal, nonmetal, metalloid? By location on Periodic Table. Which family does each belong to? Na = Alkali Metals, Li = Alkali Metals, C = Carbon Family Do they share any properties? No, however Na & Li are both very reactive because they are in the same group & have 1 valence electron.
13. How many valence electrons does each atom have? Na = 1, Li = 1, C = 4 Can you locate these elements on the periodic table by using the number of their valence electrons? Yes valence electron count = group. What is the function of an atom’s valence electrons? involved in bonding
14. Does the newest element of the periodic table, United X, belong in the same group as lithium (Li), potassium (K), and sodium (Na)? Why or why not? Yes, shared chemical properties. They all form chemical bonds with Br – Bromine.
Element Properties Element Atomic Number Density Reaction with Bromine (What does it form?) Lithium 3 0.86 g/mL LiBr Potassium 19 0.535 g/mL KBr Sodium 11 0.971 g/mL NaBr United X 115 275 g/mL UxBr
15. Which family consists of more than one group? Transition metals are groups 3-12
16. Fill in the table with as much information as you can.
Properties Metals Nonmetals Metalloids shiny, gray/silver color, dull, earth tone colors, Combination of a metal & good conductors of poor conductors of heat & a non-metal propertiy. electricity & heat, electricity, brittle, do not Example: shiny & brittle or malleable, react with acid, react with acids, never malleable & non-reactive give up electrons in magnetic, steal electrons with acid. (Note: you chemical reactions, some in chemical reactions can’t be dull & shiny at the are magnetic same time but you can be dull & malleable at the same time)