A. They are noble (inert) gases. B. They are nonmetals. C. They have the same thermal conductivity. D. They have the same number of protons.

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1 toms, Elements, ompounds and Mixtures Name: 1. Which statement is true about the charges assigned to an electron and a proton?. oth an electron and a proton are positive.. n electron is positive and a proton is negative.. n electron is negative and a proton is positive.. oth an electron and a proton are negative. 2. In the modern Periodic Table, the elements are arranged in order of increasing 5. What do the elements sulfur (S), nitrogen (N), phosphorus (P), and bromine (r) have in common?. They are noble (inert) gases.. They are nonmetals.. They have the same thermal conductivity.. They have the same number of protons. 6. What is the atomic number of an element whose atoms each contain 47 protons, 60 neutrons, and 47 electrons?. atomic number. oxidation number mass number. valence number 3. The atomic number of an atom is always equal to the total number of. neutrons in the nucleus. protons in the nucleus. neutrons plus protons in the atom. protons plus electrons in the atom 7. Which atom has a nucleus that contains 13 protons and 14 neutrons?. Mg. e. l. N 8. Which list of elements contains two metalloids?. Si, Ge, Po, Pb. s, i, r, Kr. Si, P, S, l. Po, Sb, I, Xe 4. Which statement concerning elements is true? 9. The elements in the Periodic Table are arranged in order of increasing. ifferent elements must have different numbers of isotopes.. ifferent elements must have different numbers of neutrons.. ll atoms of a given element must have the same mass number.. ll atoms of a given element must have the same atomic number.. atomic number. atomic radius. mass number. neutron number page 1

2 10. The diagram below represents the nucleus of an atom. 13. Which drawing best represents an atom of lithium?. What are the atomic number and mass number of this atom?. The atomic number is 9 and the mass number is The atomic number is 9 and the mass number is 20.. The atomic number is 11 and the mass number is 19.. The atomic number is 11 and the mass number is Which statement correctly describes the charge of the nucleus and the charge of the electron cloud of an atom?. The nucleus is positive and the electron cloud is positive.. The nucleus is positive and the electron cloud is negative... The nucleus is negative and the electron cloud is positive.. The nucleus is negative and the electron cloud is negative. 12. Which of the following is best classified as a compound? 14. Isotopes are atoms that have the same number of protons but a different. Helium (He), because it contains only one type of atom. Oxygen (O2), because it contains two of the same type of atoms. arbon dioxide (O2), because it contains two different types of atoms. Manganese (Mn), because it contains a metal and a nonmetal. number of electrons. number of neutrons. atomic number. nuclear charge page 2 toms, Elements, ompounds and Mixtures

3 15. Use the Periodic Table of Elements to answer the following question(s). 19. Use this element from the periodic table to answer the question. Which sentence about the periodic table of elements is true?. ll elements in period 2 are metals.. ll elements in group 18 are metals.. Metals are found on the left side of the periodic table.. Metals are found on the right side of the periodic table. 16. When magnesium (Mg) metal is burned in the presence of oxygen (O 2 ), magnesium oxide (MgO) is produced. The properties of magnesium oxide are different than the individual properties of magnesium and oxygen because magnesium oxide is What is the atomic mass for silicon? The circles and dots in the boxes below represent atoms of two different elements. toms touching each other are considered bonded to each other.. a solution.. a mixture.. a compound.. an element. Which box contains a mixture? 17. Which class of elements best conducts electricity?..... metals. nonmetals. semimetals. noble (inert) gases 21. Which of the following nuclei is an isotope 10p of 11n? p 9n. 11p 10n. 9p 11n. 11p 12n 22. Which of the following explains why saltwater is considered a mixture?. It is composed of one element.. It is composed of one compound. Iodine would have chemical properties most like. manganese (Mn).. chlorine (l).. tellurium (Te).. xenon (Xe).. It is composed of two or more substances and has new chemical properties.. It is composed of two or more substances that retain their own chemical properties. page 3 toms, Elements, ompounds and Mixtures

4 23. In which list are the elements arranged in order of increasing atomic mass? 26. The diagram below shows three containers of gas.. l, K, r. Fe, o, Ni. Te, I, Xe. Ne, F, Na 24. Which best describes the current atomic theory?. toms consist of electrons circling in definite orbits around a positive nucleus. ontainer R ontainer S ontainer T. toms are composed of electrons in a cloud around a positive nucleus.. toms can easily be split, at which time they become radioactive.. n atom s mass is determined by the mass of its neutrons. 25. Use the information below to answer the following question(s). Matter can be classified as an element, a compound, or a mixture. The elements sodium (Na) and chlorine (l) react with each other to form the compound sodium chloride (Nal), also known as table salt. The reaction between sodium and chlorine releases energy. This energy causes the temperature of the substances in the reaction to increase. When table salt dissolves in water a solution is formed, which is a type of mixture. Which list correctly describes the gases in containers R, S, and T?. R = element, S = compound, T = mixture. R = compound, S = element, T = mixture. R = element, S = mixture, T = compound. R = mixture, S = element, T = compound Which of these changes must happen for elements to become a compound?. elements are heated. a gas becomes a liquid. elements dissolve in water. chemical bonds form between atoms page 4 toms, Elements, ompounds and Mixtures

5 Problem-ttic format version c Educide Software Licensed for use by indy Morley Terms of Use at toms, Elements, ompounds and Mixtures 10/26/ Objective: I Objective: I

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