(1)
Chlorine exists in two isotopic forms, Cl-37 and Cl-35 but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately
Answer: 1:3
Answer: 1:3
Answer: 9
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Answer: sum of the number of protons and neutrons is same but the number of protons is different.
Answer: Overall neutrality of atom.
Answer: The mass of electron is equal to the mass of neutron.
Answer: Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube.
The density of dots in a region represents the probability density of finding electrons in the region.
On the basis of above diagram which of the following statements is incorrect?
Answer: The probability density of electrons for 2s orbital decreases uniformly as distance from the nucleus increases.
Answer: 1s2 2s2 2p6 3s2 3p6 3d9 4s2
Answer: Electrons move in a circular path of fixed energy called orbits.
Answer: C, D
Answer: 14
Answer: 5, 0, 0, + 1/2
Answer: Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
Answer: 743 nm
Answer: – 30.6 eV
Answer: Li+2
(c = 3×108 ms–1 and NA = 6.02×1023 mol–1)
Answer: 494 nm
Answer: Na+
Answer: K+, Cl–, Ca2+, Sc3+
Answer: 12 and 5
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