List of top Chemistry Questions on Atoms

The nuclear radius of hydrogen atom will be ______.
The energy equivalent of 1.0 kg of substance is ______.
The radius of the innermost electron orbit of a hydrogen atom is $5.3 \times 10^{-11}$ m. What is the radius of the $n=3$ orbit?
The ground state energy of hydrogen atom is -13.6 eV. What is the ratio of kinetic energy and potential energy of the electron of this state?
Atomicity of Phosphorus is:
Atomicity is given by:
Atomicity of an element is:
Atomicity of primary gases is:
Atomicity of oxygen in ozone molecule is:
The Greek term ‘atomos’ means:
Identify the pair of elements in which the difference in atomic radii is maximum.
Identify the pair of elements in which the number of s-electrons to p-electrons ratio is 2:3:
Among the oxides SiO\(_2\), SO\(_2\), Al\(_2\)O\(_3\), and P\(_2\)O\(_5\), the correct order of acidic strength is:
If \(n\) and \(l\) represent the principal and azimuthal quantum numbers respectively, the formula used to know the number of radial nodes possible for a given orbital is:
If first ionization enthalpy (\(\Delta H\)) values of Na, Mg and Si are respectively 496, 737, and 786 kJ/mol, the first ionization enthalpy value of Al (in kJ/mol) will be:

Match the following elements with their respective blocks in the periodic table:
 

The heights of the transmitting and receiving antennas are 33.8 m and 64.8 m respectively. The maximum distance between the antennas for satisfactory communication in line of sight mode is:
(Radius of the earth = 6400 km)
Which one of the following corresponds to the wavelength of line spectrum of H atom in its Balmer series? (R = Rydberg constant)
If the radius of the first orbit of the hydrogen-like ion is \(1.763 \times 10^{-2}\) nm, the energy associated with that orbit (in J) is:
........ is a potent vasodilator.
Identify the pair of species having the same energy from the following: (The number given in the bracket corresponds to the principal quantum number (n) in which the electron is present.)
In interference pattern, the energy is
Number of atoms of He in 100 amu of He (atomic wt. of He is 4) are:
Which of the following pairs is an isobar?
The number of spectral lines that are possible when electrons in fourth energy level in different hydrogen atoms return to ground state.