Question 11 MarkAn element having atomic number $3.5$ can be placed between Be and $B.$AnswerFalseView full question & answer→
Question 41 MarkMendeleev’s periodic law was based on atomic number of element.AnswerFalseView full question & answer→
Question 51 MarkDobereiner’s triads are observed in Newlands’ octaves.AnswerTrueView full question & answer→
Question 61 MarkPhosphorus is the eighth element after nitrogen.AnswerFalseView full question & answer→
Question 71 MarkAccording to the Newlands’ law of octaves, every eighth element had properties similar to that of the first element.AnswerTrueView full question & answer→
Question 81 MarkThe atomic masses of elements form a Dobereiner’s triad are $14 u, 31 u$ and $74.9$ u respectively.AnswerFalseView full question & answer→
Question 91 MarkAt present, naturally occurring elements are $98.$AnswerTrueView full question & answer→
Question 101 MarkEach period starts with the filling of electrons in a new shell.AnswerTrueView full question & answer→
Question 111 MarkElectrons are filled in $K, L$ and $M$ shells in the elements of the third period.AnswerTrueView full question & answer→
Question 121 MarkThere are three valence electrons present in the elements of group I.AnswerFalseView full question & answer→
Question 151 MarkCalcium, strontium and barium form a Dobereiner’s triad.AnswerTrueView full question & answer→