Subject Experts Solutions for Chapter: Atomic Structure and Transformation of Matter, Exercise 1: PRACTICE QUESTIONS (CLASSROOM WING)

The number of neutrons is equal to the number of protons present in the nucleus of two elements X and Y and their dinegative ions possess $8$ electrons in the L and M shells, respectively. Then the ratio of mass numbers of the two elements is:

What is the difference between symbol and formula?

Compare the mass of proton, neutron and electron.

How does the energy of orbits in an atom vary?

The atomic number and mass number of an element are $13$ and $27$, respectively. Find the number of neutrons.

Explain the observable change taking place during reaction of iron with the aqueous solutions of ${\mathrm{H}}_2{\mathrm{SO}}_4$ and ${\mathrm{CuSO}}_4$, respectively.

A dipositive ion of an element $\mathrm{X}$ has $10$ electrons and a dinegative ion of an atom of another element $\mathrm{Y}$ has $10$ electrons. Calculate the number of electrons and protons in the respective atoms. 

In the given chemical double displacement reaction $\mathrm{AB}+\mathrm{XY}\to \mathrm{AY}+\mathrm{XB}$, cation present in the reactant $\mathrm{XY}$ is barium ion and the anion present in the reactant $\mathrm{AB}$ is sulphate radical. In the product, $\mathrm{AY}$, the cation has three protons and the number of electrons in the uni-negative anion is equal to the number of protons of argon atom. Identify the reactants and the products. Write the balanced chemical equations.