Science Electronic Configuration

Science Electronic Configuration ​

Done by : Keziah Ann Mathew ​

​Elecronic Configuration ​

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Hello Everyone, I am Keziah, Today We are going to study about Electronic Configuration So Let's Start

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​​In an atom, the negatively charged electrons are found outside the nucleus in different shells or energy levels. The way electrons are placed in their electron shells is called electron configuration or simply electron arrangement. Number of electrons in the outer shell of an atom is called valence electrons. These are the electrons that are either transferred or shared with other atoms during chemical reactions.

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Rules

​(Note: These rules apply only for the first 20 elements)

• ​The first shell, the one closest to the nucleus,can hold only a maximum of 2 electrons.

• ​The second and third shell can hold a maximum of 8 electrons.

• ​Any extra electrons are placed in the fourth shell.

• ​Inner shells are filled before any electrons are placed in the outer shell.

Example of Carbon ​

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Multiple Choice

State the maximum number of electrons that can be placed in the first electron shell of an atom.

• 1

• 2

• 6

• 8

Multiple Choice

State the maximum number of electrons that can be placed in the second electron shell of an atom.

• 24

• 18

• 8

• 2

Multiple Choice

A chlorine atom has 17 electrons. Its electron configuration must be:

• 2,7,8

• 2,8,7

• 4,2,9

• 4,9,7

Multiple Choice

This diagram shows the electron arrangement of a sulphur atom. How many protons must be there in a sulphur atom?

• 18

• 4

• 16

• 90

Draw

Draw the Carbon's Atomic Number

​ Thank You

Enjoy your day!!!!!

This is Keziah Singing out.