Rutherford's model of atomic structure is similar to the structure of

nucleus is discovered by

Rutherford choose .......... foil for his experiment

these observations are part of which mode.1. Most of the alpha particles passed straight through the foil. 2. Some alpha particles were slightly defl ected from their straight path. 3. Very few alpha particles completely bounced back.

According to Rutherford model the electrons revolve around the nucleus in close circular paths called

Rutherford’s model failed to explain the ........... of an atom.

In 1920 Rutherford predicted the presence of another particle in the nucleus as ......

according to .............. An electron in a shell can move to a higher or lower energy shell by absorbing or releasing a fi xed amount of energy

The orbit closest to the nucleus is the ,.........shell.

Th ese orbits are associated with fi xed amount of energy , so Bohr called them as ..........

neutron was discovered by ...............

There are ....... structural parts of an atom, the nucleus and the empty space in which there are imaginary paths called orbits.

................... = Number of protons = Number of electrons

For any element, the atomic numbers are shown as .......... and mass number are shown as ..........

The difference between the mass number of an element and its atomic number gives the number of ...... present in one atom of the element.

Calculate the atomic number of an element whose mass number is 39 and number of neutrons is 20. Also find the name of the element.

the distribution of electrons is governed by certain rules or conditions, known as .......................... of electronic configuration

What is the Electronic configuration of Aluminium?

The forces between the protons and the neutrons in the nucleus are of special kind called........... force

Elements, which have valence electrons 1 or 2 or 3 (except Hydrogen) are ....

Elements with 4 to 7 electrons in their valence shell are .....

Atoms of diff erent elements with diff erent atomic numbers, which have the same mass number, are known as .......

"When two elements A and B combine together to form more than one compound, then masses of A which separately combines with a fixed mass of B are in simple ratio". .this is .....

“If two different elements combine separately with the same weight of a third element, the ratios of the masses in which they do so are either the same or a simple multiple of the mass ratio in which they combine.”this is

the numbers which designate and distinguish various atomic orbitals and electrons present in an atom are called ..........

............ are atoms of the same element, which have same atomic number but diff erent mass numbers.

According to ......................, Whenever gases react together, the volumes of the reacting gases as well as the products bear a simple whole number ratio, provided all the volumes are measured under similar conditions of temperature and pressure.

symbol of primcipal quantum number

symbol of spin quantum number

magnetic quantum number conveys