$A$ helium atom has two electrons in its valence shell,but its valency is not two. Explain.
(N/A) The valence shell of a helium atom is the $K$-shell,which can hold a maximum of $2$ electrons. Since the $K$-shell is completely filled with $2$ electrons,the atom is stable and does not need to gain,lose,or share electrons to achieve a stable configuration. Therefore,its combining capacity or valency is $0$.
Explore More
Similar Questions
The electronic configuration of an element $X$ is $2, 8, 2$.
$(a)$ Find the number of electrons present in the atom of element $X$.
$(b)$ Write the atomic number.
$(c)$ Is this element $X$ a metal or a non-metal?
$(d)$ Find out the valency of the element $X$.
$(a)$ Find the number of electrons present in the atom of element $X$.
$(b)$ Write the atomic number.
$(c)$ Is this element $X$ a metal or a non-metal?
$(d)$ Find out the valency of the element $X$.
Easy
View SolutionWhich one of the following is the correct electronic configuration of sodium?
Medium
View Solution$(a)$ Name the three subatomic particles of an atom.
$(b)$ An atom of an element has $5$ electrons in the $L$ shell.
$(i)$ What is the atomic number of the element?
$(ii)$ State its valency.
$(iii)$ Identify the element and write its name.
$(b)$ An atom of an element has $5$ electrons in the $L$ shell.
$(i)$ What is the atomic number of the element?
$(ii)$ State its valency.
$(iii)$ Identify the element and write its name.
Medium
View SolutionHelium atom has $2$ electrons in its valence shell,but its valency is not $2$. Explain.
Easy
View SolutionElements with valency $1$ are
Easy
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo