Question

An element is represented by 40X20 answer the following questions what is the mass of 'X'
how many neutrons are present in 'X'
Give electronic confugaration of 'X'
Give number of shells present in an atom of 'X'

Answer 1

Answer:

the distance selling regulations

Answer 2

The number of neutrons is 20

The number of neutrons is 20The electronic configuration is

$1s ^{2} 2s^{2} 2p^{6} 3s^{2} 3p ^{6} 4s^{2}$

and the number of shells present in the element is 4.

Given:

An element is represented as 40 X 20.

To Find:

We need to find the number of neutrons, electronic configuration, and the number of shells.

Solution:

Some basics to remember are

A X Z is the notation to represent the atomic number, mass number, and also element.

A is the mass number.

X is the element.

Z is the atomic number.

So here,

40 is the mass number

20 is the atomic number.

The element with atomic number 20 is Calcium.

$Number \: of \: neutrons= Mass \: number - Atomic \: number$

$= 40 - 20$

$= 20$

As the atomic number is 20, the electronic configuration will be as

$1s ^{2} 2s^{2} 2p^{6} 3s^{2} 3p ^{6} 4s^{2}$

From the above configuration, we can say that Calcium has 4 shells as it belongs to the 4th period.

Therefore,

The number of neutrons is 20

The electronic configuration is

$1s ^{2} 2s^{2} 2p^{6} 3s^{2} 3p ^{6} 4s^{2}$

and the number of shells present in the element is 4.

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