Though hydrogen atom contains only one electron, yet its emission spectrum consists of many lines. Give reason.

If an atom contains one electron and one proton,will it carry and charge or not?

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: Nucleus of the atom does not contain electrons, yet it emits beta -particles in the form of electrons. Reason: In the nucleus, protons and neutrons exchange mesons frequently.

Dry hydrogen chloride gas does not turn blue litmus red whereas hydrochloric acid does. Give one reason.

It is known that atom contain protons. Neutrons and electrons. If the mass of neutron is assumed to half of its orginal value where as that of proton is assumed to be twice of its original value then the atomic mass of ._(6)^(14)C will be :-

The hydrogen atom in the ground state is excited by mass of monochromatic radiations of wavelength lambda Å . The resulting spectrum consists of maximum 15 different lines . What is the value of lambda ? ( R_H = 109737 cm^(-1)) .

The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using Crystal Field Theory.

An atom of element E contains 3 protons, 3 electrons and 4 neutrons : (b) What is its mass number ?