Question

If Z = 3, what would be the valency of the element? Also, name the element.

NCERT Class IX
Sciences - Main Course Book

Chapter 4. Structure of the Atom

Answer 1

Atomic number:
The number of protons in one atom of an element is known as atomic number of that element.

Atomic number of an element= number of protons in one atom of element

Atomic number of an element is equal to the number of electrons in a neutral atom of that element

The atomic number of an element tells us 2 things:
1. It tells us the number of protons in one atom of the element.
2. It tells us the number of electrons in 1 normal atom of the element.


The atomic number of an element is denoted by the letter Z.

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Solution:

The symbol Z stands for the atomic number of an element.

Here Z= 3 , means that atomic number of this element is 3.

The electronic configuration of the element is 2,1 .

It has one electron in its outermost shell. So in this element, one atom of this element can loss 1 electron to achieve the nearest inert gas electron configuration.

Hence, the valency of the element is 1.

The element having atomic number 3 is lithium.

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Hope this will help you.....

Answer 2

Answer:if Z=3 it means it is number 3 as Z represent atomic number and atomic number of Lithium is 3 and in its configuration we will get K=2 and L=1 so valency is 1 as when the number of electrons in outermost shell are 1,2,3,pr4 the valency is same as 1,2,3,&4 respectively.

CONCLUSION=element is Lithium and valency is 1