Geeta got a doubt, ''Why does atomic nucleus contain proton and neutrons? Why can't electrons and neutrons be in it.'' Can you help to clarify her doubt? Explain.

Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have?

The nucleus of an element contains 17 protons and 18 neutrons. What is its (a) atomic number and (b) mass number? Write the complete symbol for the element.

An atom of an element contains 29 electrons ans 35 neutrons . Deduce (i) the number of protons and (ii) the electromic configuration of the element .

Why can't you able to compress a wooden block?

Atoms are complicated than hydrogen have more than one proton in their nucleus. Let z stands for the number of protons in a nucleus. Also imagine that an atom loses all but one of its electrons so that it changes into a positively charged ion with just one electron. Bohr.s formula for the energy levels of the hydrogen atom can easily be changed to apply to such ions The potential energy of electron in the ground state of He^(+) ion is

Atoms are complicated than hydrogen have more than one proton in their nucleus. Let z stands for the number of protons in a nucleus. Also imagine that an atom loses all but one of its electrons so that it changes into a positively charged ion with just one electron. Bohr.s formula for the energy levels of the hydrogen atom can easily be changed to apply to such ions What minimum amount of energy is required to bring an electron from ground state of Be^(3+) to infinity

Atoms more complicated than hydrogen have more than one proton in their nucleus. Let Z stands for the number of protons in a nucleus. Also imagine that an atom loses all but one of its electrons so that it changes into a positively charged ion with just one electron. Bohr.s formula for the energy levels of the hydrogen atom can easily be changed to apply to such ions. It becomes E_m = (-Z^2 e^4 m_e)/(8 epsi_0^2 h^2 n^2) , where m= mass of electron , e= change of electron, n = orbit number. The ionization potential of Het in ground state is

How does a solenoid behave like a magnet? Can you determine the north and south poles of a current–carrying solenoid with the help of a bar magnet? Explain.