101. Na, K etc., were obtained from ……….
102. The second period consists ……. s-block elements and ……. p-block elements.
103. There are ……. elements in the sixth period.
104. ‘4f’ elements are called ………
105. ‘5f’ elements are called ……….
106. The elements with three or less electrons in the outer shell are considered to be ……….
107. Lanthanoids and actinoids are called ……. elements.
108. Metalloids are generally ……….
109. Atomic radius is measured in ……….
110. 1 pico metre = ………. meter.
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111. Atomic radii of elements ……… across a period from left to right.
112. Atomic radii ……… from top to bottom is a group of the periodic table.
113. The size of the chlorine atom is ……… than Cl- ion.
114. The size of Na+ ion is ………. than ‘Na’ atom.
115. The energy required to remove an electron from the outer most orbit or shell of a neutral gaseous atom is called ……….
116. The energy required to remove an electron from unipositive ion of the element is called the ……… of that element.
117. More the nuclear charge ……. is the ionization energy.
118. More the screening effect ……… is the ionization energy.
119. It is …….. to remove 4f electron than 4s.
120. It is …….. to remove one electron from 8O than 7N.
121. More the atomic radius, ……… is the ionization energy.
122. Ionization energy is expressed in ………
123. Electron affinity of an element is also called electron gain ………… of that
element.
124. Electron affinity value for Chlorine is ……..
125. Metals have very …….. electron gain enthalpy values. Ionization energy + ………….
126. Electronegativity = Ionization energy + ………… / 2
127. ……….. assigned the electronegative values for elements on the basis of bond
energies.
128. Metals generally show ……….. electronegative character.
129. Non metals are generally ………. electronegative due to their smaller atomic
radii.
130. Si and Ge are …………
Answers:
101) Plant ash 102) 2, 6
103) 32 104) Lanthanides
105) actinides 106) metals
107) inner transition 108) semi conductors
109) pm (pico meter) 110) 10-12
111) decrease 112) increase
113) less size 114) less
115) ionization energy 116) 2nd ionization energy
117) more 118) less
119) easier 120) easier
121) less 122) kJ mol-1
123) enthalpy 124) -349 kJ mol-1
125) low 126) electron affinity
127) Pauling 128) less
129) more 130) metalloids