How many electrons are present in helium ( He 2 ) ?

In its neutral state, Helium has two electrons in orbit about the nucleus. Model of a helium atom's nucleus with two protons and two neutrons. Helium is a relatively inert element, which when in its neutral state is quite unreactive due to a filled outer shell of electrons.

How many electrons are present in helium ( He 2 ) ?

In its neutral state, Helium has two electrons in orbit about the nucleus. Model of a helium atom's nucleus with two protons and two neutrons. Helium is a relatively inert element, which when in its neutral state is quite unreactive due to a filled outer shell of electrons.

Write the electronic configuration of Lithium Li 3 ?

Lithium has three electrons, if 2 electrons are filled in 1 S , then the remaining electrons should enter the 2 S sub-shell as it comes next, in the order of increasing energy. The electronic configuration of Lithium is 1 s 2 2 s 1 .

Write down the subshell electronic configuration of the elements given below and complete the table. Element Number of electrons Subshell electronic configuration N 7 7 1 s 2 2 s 2 2 p 3 F 9 9 1 s . . . 2 s . . . 2 p . . . Na 11 - 1 s . . . 2 s . . . 2 p . . . 3 s . . . Al 13 - 1 s . . . 2 s . . . 2 p . . . 3 s . . . 3 p . . . Cl 17 - - Ar 18 - -

The number on the left side of the shell subshell denotes the shell number and the number on the top right side denotes the number of electrons. Element Number of electrons Subshell electronic configuration N 7 7 1 s 2 2 s 2 2 p 3 F 9 9 1 s 2 2 s 2 2 p 5 Na 11 11 1 s 2 2 s 2 2 p 6 3 s 1 Al 13 13 1 s 2 2 s 2 2 p 6 3 s 2 3 p 1 Cl 17 17 1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 Ar 18 18 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6

E M B I B E

Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise

EASY

10th Kerala Board

IMPORTANT

Earn 100

How many electrons are present in helium $({}_{2}{He})$ ?

Important Questions on Periodic Table and Electronic Configuration

EASY

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise

Complete the sub-shell electronic configuration of

({}_{2}{He})

?

EASY

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise

Write the electronic configuration of Lithium

({}_{3}{Li})

?

EASY

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise>Q ●

Complete the electronic configuration of beryllium?

EASY

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise>Q ●

Write the electronic configuration of Boron?

EASY

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise>Q ●

Write the electronic configuration of carbon?

MEDIUM

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise

Write down the subshell electronic configuration of the elements given below and complete the table.

Element	Number of electrons	Subshell electronic configuration
${}_{7}N$	$7$	$1 s^{2} 2 s^{2} 2 p^{3}$
${}_{9}F$	$9$	$1 s^{. . .} 2 s^{. . .} 2 p^{. . .}$
${}_{11}{Na}$	-	$1 s^{. . .} 2 s^{. . .} 2 p^{. . .} 3 s^{. . .}$
${}_{13}{Al}$	-	$1 s^{. . .} 2 s^{. . .} 2 p^{. . .} 3 s^{. . .} 3 p^{. . .}$
${}_{17}{Cl}$	-	-
${}_{18}{Ar}$	-	-