Chemistry
What do you understand by atomic size ? State its unit.
Periodic Table
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Answer
Atomic Size is the distance between the centre of the nucleus of an atom and its outermost shell.
Unit — Angstrom (Å) and Picometer (pm).
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Related Questions
The electronic configuration of the element T is 2, 8, 8, 1.
(i) What is the group number of T ?
(ii) What is the period number of T ?
(iii) How many valence electrons are there in an atom of T ?
(iv) What is the valency of T ?
(v) Is it a metal or a non-metal ?
Match the atomic number 19, 15, 8, 4, and 2 with each of the following :
(i) A metal of valency one.
(ii) A solid non-metal of period 3.
(iii) A rare gas.
(iv) A gaseous element with valency 2.
(v) An element of group 2.
Give the trends in atomic size on moving :
(i) Down the group,
(ii) Across the period left to right.
Arrange the elements of second and third period in increasing order of their atomic size (excluding noble gases).