ATOMIC STRUCTURE
1.The structure of atom was discovered by
Niels Bohr
2.The smallest unit of matter that have all the characteristics of an element
Atoms
3.Nucleus was discovered by
Rutherford
4.Neutron was discovered by
J Chadwick
5. What is the maximum number of electrons that can be accommodated in an orbital?
2
6.Which atom has only one electron?
Hydrogen
7. The path of the electron according to Niels Bohr’s theory was
Orbit (Shell)
8. Electron is looked upon as a cloud of negative charge according to
Wave - mechanics theory
9.The region of space around the nucleus where there is a high probability of finding an electron is called
Orbital
10.Who put forward the principle of uncertainty?
Werner Heisenberg
11.What do you mean by Avagadro’s number?
Number of particles in one mole of any substance
12.The wave nature of electron was suggested by whom?
Louis De Broglie
13.The number of electrons in oxygen atom is
8
14.Who discovered electrons?
J. J. Thomson
15.What are the neutrons and protons in an atom collectively known as?
Nucleons
16.The scientist who introduced the model of the atom similar to the solar system?
Rutherford
17.What are isotopes?
Atoms having same atomic number but different mass number.
18.What are isobars?
Atoms having same mass number but different atomic number
20.What are isotones?
Atoms having equal number of neutrons.
PERIODIC CLASSIFICATION
21.What is the basis for modern classification of the elements?
Atomic number
22.What was the basis for Mendeleev classification of elements?
Atomic weight
23.The horizontal rows of elements in the periodic table arecalled
Periods
24.Modern periodic table was developed by
Henry Moseley
25.The vertical columns of the periodic table are called
Groups
26.Which group contains the elements with largest atomic size?
First group
27.As the size of the atom increases the electronegativity
Decreases
28.What kind of elements generally form coloured compounds?
Transition metals
29.Who studied the relationship between atomic volume and atomic weight?
Lothar Meyer
30.The first group elements are called
Alkali metals
31.How many groups are there in the modern periodic table?
Eighteen
32.A solution which turns red litmus to blue is called
Alkaline
33.The elements which show the properties of both metals and non metals are called
Metalloids
34.Which period having the minimum number of elements
First period
35.The elements of the s-block and pblock are together referred to as
Representative elements
36.Where are the smallest atoms seen at the modern periodic table?
Right hand top
37.The different blocks of the Long form periodic table are
s, p, d and f
38.Where are the Largest atoms seen at the periodic table?
Bottom left
39.Which period have the largest number of elements in the periodic table?
The sixth period
40.Which is the smallest atom?
Hydrogen
41.The relative tendency of the atoms to attract electrons in chemical reactions is called
Electronegativity
42.The scientist who prepared the electronegativity scale
Linus Pauling
ELEMENTS
43.Which is the first artificial element?
Technetium
44.Most electropositive elements
Francium or Caesium
45.The element which shows highest electron affinity
Chlorine (348)
46.The most common element in the atmosphere
Nitrogen
47.The natural element having highest atomic weight
Uranium
48.The heaviest gaseous element
Radon
49.Most stable element
Lead
50.The element which is used to coat the photo copying drum of xerox
Selenium
51.The element present in Thyroid hormone
Iodine
52.The element present in DNA and RNA
Phosphorus
53.The outermost orbit of an atom is called
Valence shell.
54.The electrons present in the outmost shell of an atom iscalled
Valence electrons
55.The element contained in sea weeds
Iodine
56.The element which is the enemy of copper
Sulphur
57.Most abundant element present in our body
Oxygen
58.Which element on adding to natural rubber makes it less sticky in hot weather and less
hard in cold weather?
Sulphur
59.Which element can easily form chains?
Carbon
60. Which element in radioactive form is used for determining the age of artifacts, relics, bones etc of the past?
Carbon
61. Which element has no neutrons in it?
Hydrogen
62. Which element is used as an antiseptic?
Iodine
63. Which element is used in medicine, photography and making dyes, gives off a violet vapour
when heated?
Iodine
