The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 76
... period of 2 elements , two periods of 8 ele- ments , two periods of 18 elements , a period of 32 ele- ments , and an incomplete period . The elements in each period may be connected by tie lines with one or more corresponding elements ...
... period of 2 elements , two periods of 8 ele- ments , two periods of 18 elements , a period of 32 ele- ments , and an incomplete period . The elements in each period may be connected by tie lines with one or more corresponding elements ...
Page 77
... periods demarcated by noble gases . 0 He 2 90 Ne 10 0 la Ar K 18 ∞ 1 × 19 36 Kr Rb 36 37 Xe 54 54 555 Cs 888 Rn 86 F8 Fr 87 group la 0 period 2 1 H He 1 helium. H He 2 Li Be B 3 4 5 6 93 C N 7 8 9 10 Na Mg Al Si 11 12 13 14 15 P S 16 Cl ...
... periods demarcated by noble gases . 0 He 2 90 Ne 10 0 la Ar K 18 ∞ 1 × 19 36 Kr Rb 36 37 Xe 54 54 555 Cs 888 Rn 86 F8 Fr 87 group la 0 period 2 1 H He 1 helium. H He 2 Li Be B 3 4 5 6 93 C N 7 8 9 10 Na Mg Al Si 11 12 13 14 15 P S 16 Cl ...
Page 1017
... period of adolescence means that the young remain under adult ( primarily ma- ternal ) surveillance for a long period , during which time the juvenile acquires , by example from its mother and peers , the knowledge that will allow it to ...
... period of adolescence means that the young remain under adult ( primarily ma- ternal ) surveillance for a long period , during which time the juvenile acquires , by example from its mother and peers , the knowledge that will allow it to ...
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activity America animals appear areas atoms became become body called camera century changes characteristics chemical Church colour common complete compounds consists containing continued drugs early effect electrons elements energy example existence experience Family field Figure fins fishes groups human important increase individual industry Italy known later lens less light liquid living lower major material means ment methods move movement natural North object occur organic original Peking Pentecostal percent period permafrost personality pest Peter petroleum Philip philosophy photographs plants political position possible practice present printing problems production Quakers range region result rocks similar social South species structure surface temperature theory tion United usually widely