Question 1 :
<span>The electrons present in the outermost shell of an atom are known as</span><span> :</span>
Question 2 :
Calculate the atomic number and mass number in the following case-<br><br>The atom of an element is made up of $4$ protons, $5$ neutrons and $4$ electrons.
Question 4 :
<span>Which of the following is not true for $\displaystyle _7N ^{ 14 }$ ?</span>
Question 8 :
Maximum no. of electrons that can be present in M & N shells respectively are ________.
Question 10 :
In Rutherford experiment, most of the alpha particles go straight through the foil because________
Question 14 :
<span>If atoms of elements have completely filled the outermost shell then their combining capacity or valency is</span><span> :</span>
Question 15 :
Thomson's atomic model concluded that _____ is the constituent particle of all kinds of atoms.
Question 18 :
<span>On the basis of Rutherford's model of an atom, which sub-atomic particle is present in the nucleus of an atom?</span>
Question 19 :
What will be the number of protons, neutrons, and electrons present in <span>$^{59}_{27}Co$ respectively,</span>
Question 24 :
Which term can be used for the number of protons present in an atom?
Question 26 :
The mass number of an element is 16. If it has 8 neutrons then valence shell of this element is.
Question 27 :
Which of these have the same chemical properties, but their physical properties may be different?
Question 28 :
A neutral atom of fluorine has a mass number of $19$ and an atomic number of $9$. How many neutrons does it have?
Question 31 :
The mass number of a neutral atom is 31 electrons. What is the atomic number of this atom?<br/>
Question 32 :
Thomson showed that the stream of particles in cathode ray tube is made up of small particles which are a component of the atom and is:<br/>
Question 33 :
Which of the following is the correct atomic number of Fluorine?
Question 36 :
<span>Match the atomic numbers 4, 14, 8, 15, and 19 with </span>a gas of valency 2.
Question 37 :
The element used by Rutherford in his famous scattering experiment was
Question 38 :
Calculate the number of neutrons present in the nucleus of an element $X$ which is represented as <span>$_{15}X^{31}$.</span>
Question 40 :
The element with atomic number 56 is likely to have the same outer shell configuration as the element with atomic number __________.
Question 41 :
Which of the following is the characteristic feature of an isotopes?
Question 43 :
Rutherford's experiment on scattering of alpha particles showed for the time that the atom has :
Question 44 :
The experiment which led to the discovery of nucleus was performed by<span> :</span>
Question 47 :
Which of the statements are the drawbacks of Rutherford's model of an atom?
Question 50 :
Elements X, Y, and Z have atomic numbers 6, 9, and 12 respectively. Which one has four electrons in its valence shell?
Question 52 :
Which of the following concept was considered in Rutherford's atomic model?
Question 53 :
Statement I : $\displaystyle ^{ 12 }{ C }\ $ is an isotope of  $\displaystyle ^{ 14 }{ C }\ $.<br/>Statement II: The nuclei of both atoms have the same number of neutrons.
Question 55 :
The fundamental particles present in the nucleus of an atom are:
Question 56 :
Which of the following are isotopes?<br/>(i) Atom, whose nucleus contains 20p+15n<br/>(ii) Atom whose nucleus contains 20p+17n<br/>(iii) Atom, whose nucleus contains 18p+22n<br/>(iv) Atom, whose nucleus contains 18p+21n
