Question 2 :
In 1911, __________ came to the conclusion that the atom had a dense nucleus because most of the particles shot straight through, but some of the particles were deflected due to the dense nucleus of the gold atoms.

Question 3 :
Valency is the number of electrons accepted by a noble gas.

Question 5 :
An atom or group of atoms of the same or of different elements that behaves as a single unit with a positive or negative charge is known as :

Question 6 :
According to Rutherford, the electron revolves around the nucleus in definite orbits but :

Question 7 :
Which of the following was carried out by Rutherford in his experiment?

Question 9 :
Maximum no. of electrons that can be present in M & N shells respectively are ________.

Question 10 :
According to whose atomic model, electrons are embedded in a gel of positive charge?

Question 16 :
J.J. Thomson's atomic model could not justify the shielding of electrons from positive charges.

Question 17 :
<p>Which one of these configurations tends to gain, lose or share electrons?</p>

Question 18 :
In 1932, ___________ discovered an electrically neutral particle in the atom named as neutron.

Question 19 :
The electron which is newly added to the atom in the outer most shell of an atom is called the valence electron.<br/>

Question 21 :
Which of the following elements has three shells with no shells having even number of outer electrons?

Question 22 :
The maximum number of electrons in the third shell of an atom can be ________.

Question 23 :
The presence of nucleus in an atom is determined by Rutherford $\alpha - ray$ scattering experiment.<br/>

Question 24 :
Goldstein's work with anode rays of $H^+$ was apparently the first observation of the :

Question 26 :
Valency can be defined as the same number of hydrogen atoms or double the number of oxygen atoms that element combines with.

Question 27 :
The maximum number of&#160;electrons that can be accommodated in the outermost orbit is&#160;:

Question 30 :
Stability of an atom was successfully explained by Rutherford's atomic model.<br/>

Question 31 :
A species having only one electron has ionization energy of $11810\quad { mol }^{ -1 }$. The number of protons in its nucleus will be:

Question 32 :
For a monoatomic ion, the net charge on&#160;the atom is its valency.

Question 36 :
An element X has $7$ electrons in its L shell. What is true about the element?<br/>I. It belongs to period $9$ of a modern periodic table.<br/>II. Its atom contains $9$ protons.<br/>III. It has a valency of $7$.<br/>IV. Its atoms can accept one&#160;electron to acquire noble gas configuration.<br/>

Question 37 :
The number of electrons present in the valance shell of central atom of methyl carbocation is:

Question 38 :
The letters X, Y and Z represent different atoms.<br/><blockquote>40 &#160; &#160; &#160; &#160; &#160; &#160;39 &#160; &#160; &#160; &#160; &#160; 40<br/>&#160; &#160; X &#160; &#160; &#160; &#160; &#160; &#160; &#160;Y &#160; &#160; &#160; &#160; &#160; &#160; Z<br/>19 &#160; &#160; &#160; &#160; &#160; &#160;19 &#160; &#160; &#160; &#160; &#160; 20<br/></blockquote>What can be deducted from the proton numbers and nucleon numbers of X, Y, and Z?

Question 39 :
Which of the following pair of symbols represents nuclei that have the same number of neutrons?