Chemistry
Write the electronic configuration of the element 3517T.
(a) What is the group number of T?
(b) What is the period number of T?
(c) How many valence electrons are there in an atom of T?
(d) What is the valency of T?
(e) Is it a metal or a non-metal?
(f) State number of protons and neutrons in T.
Periodic Table
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Answer
The electronic configuration of 3517T is [2, 8, 7]
(a) Group number of T — VIIA [∵ it has 7 valence electrons]
(b) Period number of T — Third period [∵ it has 3 shells]
(c) Valence electrons — Seven [from electronic configuration]
(d) Valency of T is -1. [∵ it needs to gain one electron to complete its octet]
(e) T is a non-metal [∵ it has a tendency to accept electrons]
(f) Protons = 17, Neutrons = 18
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Group 1 Group 2 Group 17 Group 18 – – – D – B C – A – – E (a) State which are metals, non-metals and noble gas in this table.
(b) State which is the most reactive (i) metal (ii) non-metal.
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