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

.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 states that properties of elements are a periodic function of their atomic number''? A) Dobereiner's triads B) Modern periodic law C) Newlands's law of octaves D) Mendeleev's periodic law

Atomic number is the basis of : (p) Lother Meyer curve (q) Newland octave rule (r) Modern periodic table (s) Dobereiner triad rule (t) Long form of periodic table

Which of the following remains constant while moving down the group of the periodic table? (a) Atomic radius (b) Metallic character (c) Number of shells in the atom (d) Valence electrons H

Which of the following atoms and ions are isoelectronic (i.e. Have dor the same number of electrons) with a neon atom a C b. O^(2-) c. n^(Theta) d. F^(o+) e. Na^(o+) f. AI^(3+)

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

Fill in the blanks in the following statements : (a) The number of protons in the nucleus of an atom is called its ……… (b) The total number of protons and neutrons in the nucleus of an atoms is called its ……… (c) An atom has atomic mass number 23 and atomic number 11. The atom has ....... electrons. (d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ........ (e) If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ........ (f) Almost all the mass of an atom is concentrated in a small region of space called the ........ (g) Cathode rays are a beam of fast moving ........ (h) The anode rays obtained from hydrogen gas consist of particles called ........ (i) The maximum number of electrons that can be accommodated in L shell are ........ (j) The maximum number of electrons that can go into the M shell is ....... (k) The subatomic particle not present in a hydrogen atom is ......... (l) The electron has .......... charge, the proton has ......... charge, and the neutron has .......... charge.