Question

READ THE PASSAGE CAREFULLY AND ANSWER THE FOLLOWING QUES:
The next important concept in our notes of the structure of an atom is that of valency. The negatively charged particles present in the outermost shell are called Valence Electrons. These valence electrons are responsible for the valency of an atom. Valency is the tendency of an atom to react with the other atoms of the same or various elements. The atoms that fill the outermost paths show chemical activity towards other valence electrons. This reactivity is responsible for the formation of molecules between two or more atoms. The valency becomes zero for an atom when the outer bounds have eight electrons or no electrons to lose. The particle with eight electrons in the outermost shell is an octet, and these molecules are mostly inert in nature.

20. An Z = 3, what is its valency of the element.
21. Why would atoms want to complete their octet.
22. Number of valence electrons in Cl- ion is a) 16 b) 8 c) 18 d) 7
24. An atom has 11 protons and 12 neutrons. What will be the valency of the element
25. Helium has 2 electrons in its valence shell, but its valency is not 2. Explain​

Answer 1

Answer:

20 . (Z = 3) = 1s2 2s1

Hence, the valency of the element is 1 (since the out

21 . Octet means to gain 8 electrons in the outermost orbit. atom wants to complete its octet of electron took a noble gas configuration so that they could be a stable in nature.

22 .Chlorine Ion (Cl⁻) have 18 electrons in their shell. So there are 8 valence electrons.

24 .The correct answer is 23.

25.Helium atom has only one shell (K shell) which can have maximum 2 electrons. Thus, its shell is already complete called duplet. It can neither lose electrons nor gain electrons. Hence, its valency is 'zero'.

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