Information for the element lead (Pb) is shown. 1. Base your answer to the question on the portion of the Periodic Table of the Elements below and on your knowledge of science. Four spaces on the table have been labeled a, b, c, and d. Information for the element lead (Pb) is shown. 1. In which labeled space on the portion of the table should the element lead (Pb) be placed? A B C D

A Chemist is identifying the elements present in a sample of seawater A Chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s chemical reactivity ? a. The number of protons b. The number of neutrons c. The location of valence electrons d. The number of valence electrons

3. Which of these formulas contain equal numbers of nitrogen atoms? a. Formulas I and III b. Formulas I and IV c. Formulas II and III d. Formulas I, II, V

4. Which element from the periodic table chemically reacts in a way similar to the way the element chlorine (Cl) reacts? a. Si b. O c. Xe d. I

5. The periodic table is organized into groups and periods of elements 5. The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below. Which of these elements is in this group? a. Lithium b. Strontium c. Aluminum d. Silicon

6. Which element is classified as a noble gas? a. sulfur b. Oxygen c. argon d. nitrogen

What is the mass number of Potassium (K) atom that has 20 neutrons? c. 20 d. 39

8. The table below lists 3 characteristics about an element 8. An atom of which element is described by the data in the table? a. Radon (Rn) b. Cadmium ( Cd) c. Rubidium ( Rb) d. Astatine ( At)

A model of a beryllium atom is shown below. 9. How would someone describe the particles found in the nucleus? a. Positively charged particles and negatively charged particles b. Negatively charged particles only. c. Neutral particles and positively charged particles. d. Positively charged particles only.

A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristics of calcium is most closely related to its chemical reactivity? a. The 20 protons in each atom of calcium b. The density of calcium, which is 1.54 g/cm3 c. The atomic mass of calcium, which is 40.078 amu. d. The 2 valence electrons in each atom of calcium

For an investigation a student records data about four unknown substances The student then calculates the densities of the unknown substances and compares them with the table of densities of known substances shown below. 11. Which unknown substance is most likely carbon? a. Substance 1 c. Substance 3 b. Substance 2 d. Substance 4

12. Which two elements on the periodic table are in the same period? a. Sn and Rb b. F and Cl c. K and Ba d. Se and Te

The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity? a. The element is sodium, and its is highly reactive b. The element is fluorine, and it is not very reactive. c. The element is sodium, and it is not very reactive. d. The element is flourine, and it is hignly reactive.

14. Aluminum, sulfur, and chlorine are elements found on the periodic table. Tests involving these three elements would show that at normal room temperature — a. A sulfur is malleable and aluminum conducts electricity b. chlorine is malleable and conducts electricity c. aluminum is malleable and conducts electricity d. all three elements are malleable and conduct electricity

15. In which of these compounds are there twice as many oxygen atoms as hydrogen atoms? a. b. c. d.

16. Based on its chemical formula; which of the following substance is an ORGANIC compound:

The Chemical formula for sodium sulfate Na2SO4. How many sulfur atoms are in the formula for sodium sulfate? 1 2 6 7

A model of an atom is shown below 18. Which group does the element belong to? a. Group 11 b. Group 12 c. Group 13 d. Group 15

Which of the following best describes an atom? a. It has no charge and about the same mass as a proton. b. It has a negative charge and much less mass than a proton. c. It has a positive charge and much more mass than a neutron. d. It has a negative charge and about the same mass as a ne

At room temperature this element is a very stable gas. NUMERICAL RESPONSE: An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom? Record your answer and fill in the bubbles on your answer document. Be sure to sue the correct place value.