.Which of the following combination is incorrect in relation to periodic table?
1) Dobereiner's triads "- Li,Na,"K
2) Eka - Aluminium - germanium
3) Lothermeyer - plotted the physical properties such as atomic volume against atomic weight
4) Inverted pair-Te, I

Which of the following match is correct (A) Base of mendeleef periodic table - Number of protons (B) Doberenier's triad - Na,"K,Rb (C) Newland's octave rule is obeyed by "H,F,Cl, (D) Lother meyer curve plotted between - Atomic number V/S Atomic weight

How many of the following statements are correct according to Mendeleef's period table ? (a) Mendeleef corrected the atomic weight of Be, In and Os b) Ar-k, Te-I and Co-Ni are anomalous pairs. c) Atomic weights of elements were corrected by using the relation Atomic Wt. (Eq.Wt) (valency) d) Eka baron is scandium e) Eka silicon is germanium f) Eka aluminium is galium g)This classification is based on valency h) Mendeleef's law is based on atomic weights

Read the passage and answer the following questions. Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of the.ir atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Mention the group and the period of these elements in the modern periodic table.

Read the passage and answer the following questions. Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of the.ir atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Name the elements which have taken the place of these elements.

Read the passage and answer the following questions. Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of the.ir atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. How many valence electrons are present in each one of them?

Read the passage and answer the following questions. Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of the.ir atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Classify these elements as metals, non-metals and metalloids.

Which of the following is incorrect about given compound ? (1) It contains eight \(sp^{2}\) hybridized carbon atoms. (2) It contains one \(4^{o}\)carbon. (3) Its IUPAC name is 3,3- Diethenylpenta-1,4-diene (4) It contains four hydrogen atoms.