ICSE Class 10 Answered
a. Name the element with the maximum non-metallic character from the elements of period 2.
b. Name a light element in period 3 with a neutron/proton ratio around 1.
c. Name the element with the least atomic size from carbon, nitrogen, boron and beryllium.
Asked by saibaba1069 | 24 Apr, 2020, 08:16: PM
Expert Answer
(a) Non-metallic character increases from left to right. So, maximum non-metallic of the period-2 is Neon (Ne).
(b) Mg
Lightest element is Na in period 3 but netrom proton ratio is not one. Next light element is Mg. In Mg, number of neutrons=number of protons=12.
(c) Nitrogen.
Because atomic size decreases across a period due to molre number of electrons in valence shell and screening effect.
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