Question

From the elements 19A39,14B28,8C16 and 18D40 identify :

(a) the most electro positive element.
(b) a noble gas.
(c) a metalloid.
(d) an element which will gain 2 electrons to attain nearest noble gas
configuration
(e) formula of compound formed between A and C.
(f) elements belonging to same period.
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Answer 1

(a)19A39(b)18D40(d)8C16(e)A2C(f)14B28,8C16 ; the elements are K,N,Oand Ar

Answer 2

The answers to the listed questions are as follows:

• The most electro positive element is ¹⁹A₃₉ (Potassium).
• ¹⁸D₄₀ (Argon) is a noble gas.
• ¹⁴B₂₈ (Silicon) is a metalloid.
• An element which will gain 2 electrons to attain nearest noble gas configuration is ⁸C₁₆ (oxygen).
• Formula of compound formed between A and C is A₂C (Potassium oxide).
• Elements belonging to same period are B and D ( oxygen and argon respectively). Both belongs to the second period of the periodic table.