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Nt1310 Unit 6

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ACTIVITY: UNDERSTANDING ELECTRONIC CONFIGURATION, VALENCE AND VALENCE ELECTRONS.
You are provided three necklace chains with 17 beads and one button. Consider the necklace chain as shells, beads as electrons and button as nucleus. You have to fill the electron shells around nucleus by putting these 17 beads into the three necklace chains around button following the Bohr-Burry and Octet Rule.
Identify the element, its electronic configuration, valency and number of valence electrons.
QUESTIONS AND ANSWERS
VERY SHORT ANSWER QUESTIONS:
1) Write the electronic configuration of an element with atomic number 19.
Answer: The electronic configuration of an element with atomic number 19
K L M N
2 8 8 1

2) How many enery levels or shells are accomodated …show more content…
7) Find valency of Fluorine and Beryllium atoms?
Answer: Keep in view, the follwing two rules to find valency of an element i.e.
Rule-1: If the outermost shell of an atom of the element contains electrons less than or equal to 4, the valency of the atom is equal to the number of valence shell electrons.
Rule-2: If the outermost shell of an atom contains electrons more than 4, the valency of an atom is then given by subtracting the valence shell electrons from 8.
Electronic configuration of Fluorine is 2, 7. Here, valence electrons are 7
Hence, valecny of Fluorine is = 8 _ 7 = 1
Electronic configuration of Beryllium is 2, 2. Thus, there are 7 valence electrons
Hence, valency of Beryllium is 1.
8) Why Neon and Argon have zero valency?
Answer: Tendency of an element to gain or lose electron in order to complete its octet is known as its valency.
Neon and Argon have completely filled outermost shell, i.e. they have octet configuration, so they have no need to gain or lose electrons (see their electronic configurations

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