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
64. Which is the most essential element for plant growth?
Nitrogen
65.Which element is highly present in sea cucumber?
Vanadium
66. Which element was named ‘inflammable air’?
Hydrogen
METALS AND MINERALS
67.Which is the best conductor of electric current?
Silver
68. The main ores of Aluminium
Bauxite and Cryolite
69.Metals extracted from sea water
Magnesium and sodium
70. Major metals present in Chloroplast
Magnesium, Manganese,Copper and Iron
71. Most abundant metal present in blood
Potassium
72. The hardest metal is
Chromium
73.Noble metals
Silver, Platinum, Gold
74.The first metal to be used by man
Copper
75.“King of metal” is
Gold
76. The metal of future
Titanium
77.The metal found in the rocks of moon /Lunar metal is
Titanium
78. Metal used for the manufacture of aeroplane
Titanium
79. Metal present in the exhaust gases of vehicles
Lead
80. An important metal present in the eyes of animals
Zinc
81.Metal used in batteries of car
Lead
82.Metal present in Insulin
Zinc
83.Electro positive elements:
An atom that loses one or more electrons
84.Electro negative elements:
An atom that gains one or more electrons
85.The element having the highest boiling point
Rhenium
86.The element having the largest number of isotopes
Tin (10 isotopes)
87.Element having highest reactivity
Fluorine
88.Element used as bleaching agent
Chlorine
89.Most abundant element in the earth crust
Oxygen
90.The most abundant metal in the earth’s crust ?
Aluminium
91. Element having the highest electronegativity
Fluorine
92. The most abundant element in the universe
Hydrogen
93.The lightest element known is
Hydrogen
94.The lightest metal is
Lithium
95.Name the element kept by covering with paraffin
Lithium
96.Element used in the manufacture of insecticides
Chlorine
97.Metal used in torch cell
Zinc
98.What is the purest form of iron?
Wrought Iron
99.Which mineral has the nickname ‘fool’s gold’?
Iron pyrites
100.The earthy impurities present in the ore are called
Gangue
101.Which metal remains in liquid state at 0°C?
Mercury
102. Ruby is mainly the oxide of
Aluminium
103.The metal having highest boiling point
Tungston
104. The fusible substance obtained when flux combines with the gangue is known as
Slag
105. Write the name of three softmetals:
Lithium, Sodium, Potassium
106. Name three metals which are in the liquid state on a hot day
Mercury, Gallium, Cesium
107. Write the names of three metals which do not react with oxygen:
Silver, Platinum, Gold
108. Bismuth Aurite is the mineral of
Gold
109. Which chemical causes Minamata disease?
Mercury
110. Which alkali metal is denser than water?
Lithium
111. The elements which undergo chemical change losing electrons are in generally called
Metals
112. What is the blue mineral of aluminium?
Lapislazuli
113.Which is the black impure aluminium oxide mineral found in nature?
Emery
114.Which metal is essential for the production of haemoglobin?
Iron
115. What is a metallic radical present in toilet soap?
Potassium
116. Which metal is added to gold for making ornaments?
Copper
117. Which metal is contained in chlorophyll?
Magnesium
118. Which are the two metals kept in kerosene?
Sodium, Potassium
119. Which metal is used in the filaments of electric lamps?
Tungsten
120.Which metal has the highest density?
Osmium
ALLOYS
121. Bronze is an alloy of
Tin and copper
122.Alloy having low melting point
Solder
123. Alloy used to make rock driller
Manganese
124.Alloy used to make springs and suspension
Phospher Bronze
125. Constituent metals contained in the alloy sterling silver
Copper and silver
126. Alloy used in the manufacture of gun barrels
Gun metal
127. Constituent metals contained in chrome steel
Iron and Chromium
128. Alloy used in the manufacture of pendulum of clock
Invar
129. Constituent metals contained in Invar
Iron and Nickel
130. Which is the first alloy, a mixture of two metals to be made in the world?
Bronze
131. Which alloy is used for preparing strong magnets
Alnico
132.Name the alloy used for casting engine parts?
Silumin
133. Alloy used for the construction of air craft
Duralumin
134. What is galvanising
Coating iron with Zinc
135.What do you mean by calcination?
Heating in the absence of air
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