Question

The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are : [Main April 12, 2019 (I)] (a) 16,5 and 2 (b) 15,5 and 3 (c) 16,6 and 3 (d) 15,6 and 2

Name: Problem 2, Chapter 3: 43 Years JEE ADVANCED (1978-2020) + JEE MAIN Chapterwise & Topicwise Solved Papers Chemistry
Uploaded: 2021-09-28T13:33:50-08:00
Duration: 1 min 14 s
Channel: Akhil Choudhary
Description: The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are : [Main April 12, 2019 (I)] (a) 16,5 and 2 (b) 15,5 and 3 (c) 16,6 and 3 (d) 15,6 and 2

   The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are :
[Main April 12, 2019 (I)]
(a) 16,5 and 2
(b) 15,5 and 3
(c) 16,6 and 3
(d) 15,6 and 2

43 Years JEE ADVANCED (1978-2020) + JEE MAIN Chapterwise & Topicwise Solved Papers Chemistry

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Chapter 3, Problem 2

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Solved by Expert Akhil Choudhary

09/28/2021

Step 1

The atomic number is equal to the number of protons in an atom, which is also equal to the number of electrons in a neutral atom. So, the electron configuration of this element can be written as $1s^2 2s^2 2p^6 3s^2 3p^3$. Show more…

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The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are : [Main April 12, 2019 (I)] (a) 16,5 and 2 (b) 15,5 and 3 (c) 16,6 and 3 (d) 15,6 and 2

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Key Concepts

Group Number

The group number is the column in the periodic table that helps classify elements with similar chemical properties. For many main-group elements, it often corresponds to the number of electrons in the outermost shell, which plays a crucial role in determining an element's reactivity and bonding characteristics.

Valence Electrons

Valence electrons are the electrons found in the outermost shell of an atom. They are primarily responsible for an element's chemical behavior since they participate in bond formation during chemical reactions.

Valency

Valency is a measure of the ability of an element to combine with other elements, usually defined by the number of electrons an atom can lose, gain, or share to achieve a stable electron configuration. It represents the number of bonds an atom can typically form with other atoms.

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