"); document.writeln("	"); document.write(""); document.writeln(""); document.writeln("

"
		if (isCorrect)
			text += ""
		else
			text += ""

		if (listMap.charAt(answerIndex) == "1") {
			if (responseText.length == 0)
				responseText = " ";
			text += " " + responseText + " ";
		}

		text += "

Name:    Chapter 10 The Periodic Table

Modified True/False Indicate whether the sentence or statement is true or false.  If false, change the identified word or phrase to make the sentence or statement true.
T F	1.	The central core of an atom is called the hub.  _______________
T F	2.	The chart showing the classifications of elements according to their properties and increasing atomic numbers is called the periodic table.  _______________
T F	3.	The mass of an electron is about equal to the mass of a proton.  _______________
T F	4.	Elements arranged in vertical columns in the periodic table are called periods.  _______________
T F	5.	The region around the nucleus occupied by the electrons is called the negative zone.  _______________
T F	6.	The symbol for chlorine is C.  _______________
T F	7.	The maximum number of electrons in the second energy level of an atom is 4.  _______________
T F	8.	Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two protons.  _______________
T F	9.	Nonmetals are poor conductors of heat and electricity.  _______________
T F	10.	Seven electrons in the outermost energy level is characteristic of a metal.  _______________
T F	11.	The number of protons in an atom is called the atomic mass.  _______________
T F	12.	The sum of the number of protons and neutrons in an atom is the mass number.  _______________
T F	13.	The weighted average of the mass numbers of all the isotopes that occur in nature for a particular element is the average atomic number.  _______________
T F	14.	A very stable electron arrangement in the outer energy level is characteristic of noble gases.  _______________
T F	15.	Elements having three or fewer electrons in the outer energy level are classified as nonmetals.  _______________
T F	16.	The atomic masses of the elements are NOT whole number values because of the existence of quarks.  _______________
T F	17.	The identity of an element is determined by the number of protons.  _______________
Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
A B C D	18.	Each inner energy level of an atom has maximum numbers of _____ it can hold. a. electrons c. quarks b. neutrons d. protons
A B C D E	19.	Dot diagrams are used to represent _____. a. atomic numbers b. atomic mass c. isotopes d. outer electrons e. the structure of the nucleus
A B C D E	20.	A chemical symbol represents the _____ of an element. a. name b. reaction c. group d. structure e. type
A B C D E	21.	Horizontal rows of the periodic table are called _____. a. clusters b. families c. groups d. periods e. quarks
A B C D E	22.	Atoms of the same element with different numbers of neutrons are called _____. a. isotopes b. metals c. metalloids d. radioactive e. transition elements
A B C D E	23.	A particle that moves around the nucleus is _____. a. an electron b. an ion c. a neutron d. a quark e. a proton
A B C D E	24.	Elements in Groups 3 through 12 of the periodic table are called _____. a. isotopes b. metalloids c. metals d. noble gases e. transition elements
A B C D E	25.	A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is _____. a. 26 b. 30 c. 52 d. 56 e. 82
Short Answer
	26.	How are the isotopes of carbon the same and how are they different?
	27.	A common radioactive isotope of carbon is C-14. How many protons, neutrons, and electrons does it have?
	28.	One isotope of uranium is U-238. How many protons, neutrons, and electrons does it have?
Problem
	29.	Suppose that you have just discovered a new element and have named it neptunite. While studying your new element, you find that it has two isotopes—neptunite-220 and neptunite-250. What is the average atomic mass of your new element? (Assume that these two isotopes are present in equal amounts in nature.)
	30.	Assume that an element is composed of one isotope with a mass of 142 and another isotope with a mass of 145. For each atom with a mass of 142, there are three atoms with a mass of 145. What is the average atomic mass of the element?