(a) What are isotopes ? Explain by giving an example (b) Give one similarity and one difference between a pair of isotopes (c) Give the number of protons, neutrons and electrons per atom in the two isotopes of chlorine `._(17)^(35)Cl and ._(17)^(37)Cl`.
Give the number of neutrons in an atom of the isotope ""_(47)^(107)Ag.
For chlorine Z=17,A =35.Give the number of protons ,electrons and neutrons in (i)chlorine atom ,(ii) chloride ion.
Give two differences between pure substances and mixture. Give one example of each.
(a) What are heterotrophs ? Give one example of heterotrophs. (b) What is the difference between autotrophic nutrition and heterotrophic nutrition ?
(a) What are radioactive isotopes ? Give two examples of radioactive isotopes (b) Give any two uses of ratioactive isotopes (c) An element Z contains two naturally occuring isotopes ._(17)^(35) Z and ._(17)^(37)Z . If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.
LAKHMIR SINGH & MANJIT KAUR-MODEL TEST PAPER 4-Section B
