Neon

Fill in the blanks in the following statements. (a) Rutherford's alpha -particle scattering experiment lead to the discovery of the …….. . (b) Isotopes have same……… but different……. . (c) Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be...... and........ respectively. (d) The electronic configuration of silicon is .......... and that of sulphur is........ .

(a) Why do we classify elements ? (b) What were the two criteria used by Mendeleev in creating his Periodic Table ? (c ) Why did Mendeleev leave some gaps in his Periodic Table? (d) In Mendeleev's Periodic Table, why was there no mention of Noble gases like Helium, Neon and Argon? (e ) Would you place the two isotopes of chlorine , Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same ? Justify your answer.

A closed container of volume 0.02m^3 contains a mixture of neon and argon gases, at a temperature of 27^@C and pressure of 1xx10^5Nm^-2 . The total mass of the mixture is 28g. If the molar masses of neon and argon are 20 and 40gmol^-1 respectively, find the masses of the individual gasses in the container assuming them to be ideal (Universal gas constant R=8.314J//mol-K ).

A closed container of volume 0.02m^3 contains a mixture of neon and argon gases, at a temperature of 27^@C and pressure of 1xx10^5Nm^-2 . The total mass of the mixture is 28g. If the molar masses of neon and argon are 20 and 40gmol^-1 respectively, find the masses of the individual gasses in the container assuming them to be ideal (Universal gas constant R=8.314J//mol-K ).

Monochromatic radiation of wave length 640.2 nm (1nm=10^(-9)m) from a neon lamp irradiates a photosensitive material made of calcium or tungsten. The stopping voltage is measured to be 0.54V. The source is replaced by an iron source and its 427.2 nm line irradiates the same photocell. Predict the new stopping voltage.

A diver uses noen- oxygen mixture containing 70.4 g dioxygen and 167.5 g neon for respiration under water. If the total pressure is 25 bar then find partial pressures of oxygen and neon in the mixture? Atomic mass of oxygen is 16 u and that of neon is 20.2 u.

A sample of helium and neon gases has a temperature of 300 K and pressure of 1.0 atm . The molar mass of helium is 4.0 g//mol and that of neon is 20.2 g//mol . (a) Find the rms speed of the helium atoms and of the neon atoms. (b) What is the average kinetic energy per atom of each gas ?

Both neon [ M_(Ne) = 20 xx 10^(-3) kg] and helium [M_(He) = 4 xx 10^(-3) kg] are monoatomic gases and can be assumed to be ideal gases. The fundamental frequency of a tube (open at both ends ) of neon is 300 Hz at 270 K (R = ( 25//3) J//K mol) The length of the tube is

Both neon [ M_(Ne) = 20 xx 10^(-3) kg] and helium [M_(He) = 4 xx 10^(-3) kg] are monoatomic gases and can be assumed to be ideal gases. The fundamental frequency of a tube (open at both ends ) of neon is 300 Hz at 270 K (R = ( 25//3) J//K mol) The fundamental frequency of the tube if the tube is filled with helium , all other factors remaining the same is