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In II period most acidic oxide is formed by:
(a) Non-metallic oxides are acidic and acidic nature increases along the period.
Elements of group IB and IIB are called:
(b) Transition elements are present in B sub gp. of Mendeleev's periodic table.
Which element has the greatest tendency to lose electron?
(b) Metal possess more tendency to lose electron.
The outer electron configuration of Gd (Atomic no. 64) is:
(d) Gadolinium (64Gd) has [Xe]54 4f7 5d16s2 configuration.
The radius of La3+ (at. no. 57) is 1.06 The radius of Lu3+ (at.no. 71) might be:
(b) Due to lanthanoid contraction
Which of the following transition metal ions has the lowest density?
(c) Density increases along the period.
Ionic radii are
[2004]
Which one of the following has the highest melting point?
Among the given options, aluminum (Al) has the highest melting point. This is because aluminum has stronger metallic bonds due to its higher electronegativity and smaller atomic radius compared to the other options. Stronger metallic bonds require more energy to overcome, resulting in a higher melting point.
Which one is a metalloid?
(b) it shows intermediate properties between metals and non metals.
Zn and Cd do not show variable valency like 'd' block elements due to :
(b) It is a fact.
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