1) What is the organization principle of Mendeleev's periodic table? a) Atomic mass order b) Atomic number order c) Electrons count d) Molecular weight 2) What are the horizontal rows called? a) Groups b) Families c) Periods d) Columns 3) How many elements are naturally occurring? a) 118 b) 120 c) 100 d) 98 4) What does an element's atomic number represent? a) Number of electrons b) Atomic mass units c) Number of protons d) Number of neutrons 5) What are valence electrons? a) Neutrons in nucleus b) Electrons in the outer shell c) Protons in nucleus d) Inner electrons 6) Which property is typical of metals? a) Dull and brittle b) Shiny c) Ductile and malleable d) Poor conductors 7) What is a characteristic of non-metals? a) Malleable b) Good conductors c) Dull and brittle d) Shiny and ductile 8) Metalloids are known to be? a) Inert gases b) Highly reactive gases c) Poor conductors d) Between metals and non-metals 9) How many columns are in the periodic table? a) 20 b) 12 c) 18 d) 10 10) Which group does hydrogen belong to? a) Group 2 b) Group 1 c) Group 17 d) Not a member of any group 11) What is a characteristic of alkali metals? a) Poor conductors b) Very reactive c) Dull and brittle d) Inert 12) Which group contains the noble gases? a) Group 18 b) Group 17 c) Group 2 d) Group 1 13) What is true about noble gases? a) Have 7 valence electrons b) Extremely un-reactive c) Found in compounds d) Highly reactive 14) Which elements are called rare earth elements? a) Alkali metals b) Halogens c) Transition metals d) Lanthanides and actinides 15) What does a period in the periodic table represent? a) Same atomic number b) Same properties c) Same energy level d) Same number of protons 16) Which property is typical of non-metals? a) Good conductors b) Poor conductors c) Malleable d) Ductile 17) What is the main use of valence electrons? a) Radioactivity b) Bond formation c) Atomic mass d) Nuclear energy 18) Which group has elements with 2 valence electrons? a) Group 1 b) Group 2 c) Group 17 d) Group 18 19) Which element is in Group 17? a) Oxygen b) Neon c) Chlorine d) Sodium 20) What is the atomic mass? a) Protons + Neutrons b) Mass of nucleus c) Protons only d) Electrons only 21) Who organized the periodic table by atomic mass? a) A. Rutherford b) B. Bohr c) C. Mendeleev d) D. Thomson

Periodic table

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