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Select the element of positive electron gain enthalpy

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Important Questions on Classification of Elements and Periodicity in Properties

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An element, X has electronic configuration of 2,8,8,2. The incorrect statement(s) about this element is/are

(i) It belongs to 10 th group of the periodic table.
(ii) It has 20 protons.
(iii) Its ionisation energy is higher than the element placed left to this in the same period but lower than the element placed just above it.

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Which of the following elements show properties that are characteristic of both metals and non-metals?
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Which of the following pairs of elements do not follow Newland's law of octave?
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The electronic configuration for the various elements are given below

a. 1s22s22p5
b. 1s22s22p63s1
C. 1s22s22p63s2
d. 1s22s22p6

From the above configurations, the correct order of their ionisation energy will be