(i) The atomic number of an element represents the number of protons in its nucleus, and in a neutral atom, it also represents the number of electrons. So, an element Y with an atomic number of 18 has 18 electrons. The electronic arrangement of these electrons in energy levels or shells follows the 2n^2 rule, where n represents the energy level.

The first energy level (n=1) can hold up to 2*1^2 = 2 electrons.
The second energy level (n=2) can hold up to 2*2^2 = 8 electrons.
The third energy level (n=3) can hold up to 2*3^2 = 18 electrons.

However, the third energy level is filled to its maximum capacity (18 electrons) only in the case of the element Argon (Atomic number 18).

So, the electronic arrangement of element Y (Atomic number 18) is 2, 8, 8.

(ii) Element Y with atomic number 18 is Argon. Argon is a noble gas and it is often used in lighting and other high-energy devices. One of its most common uses is in fluorescent and other types of lighting because it doesn't react with the filament in a light bulb even under high temperature. It is also used in welding to provide an inert atmosphere that protects the weld from oxidation.

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(i) The atomic number of an element represents the number of protons in its nucleus, and in a neutral atom, it also represents the number of electrons. So, an element Y with an atomic number of 18 has 18 electrons. The electronic arrangement of these electrons in energy levels or shells follows the 2n^2 rule, where n represents the energy level.

The first energy level (n=1) can hold up to 2*1^2 = 2 electrons.
The second energy level (n=2) can hold up to 2*2^2 = 8 electrons.
The third energy level (n=3) can hold up to 2*3^2 = 18 electrons.

However, the third energy level is filled to its maximum capacity (18 electrons) only in the case of the element Argon (Atomic number 18).

So, the electronic arrangement of element Y (Atomic number 18) is 2, 8, 8.

(ii) Element Y with atomic number 18 is Argon. Argon is a noble gas and it is often used in lighting and other high-energy devices. One of its most common uses is in fluorescent and other types of lighting because it doesn't react with the filament in a light bulb even under high temperature. It is also used in welding to provide an inert atmosphere that protects the weld from oxidation.

Knowee AI · Accepted Answer

(i) The atomic number of an element represents the number of protons in its nucleus, and in a neutral atom, it also represents the number of electrons. So, an element Y with an atomic number of 18 has 18 electrons. The electronic arrangement of these electrons in energy levels or shells follows the 2n^2 rule, where n represents the energy level.

The first energy level (n=1) can hold up to 2*1^2 = 2 electrons.
The second energy level (n=2) can hold up to 2*2^2 = 8 electrons.
The third energy level (n=3) can hold up to 2*3^2 = 18 electrons.

However, the third energy level is filled to its maximum capacity (18 electrons) only in the case of the element Argon (Atomic number 18).

So, the electronic arrangement of element Y (Atomic number 18) is 2, 8, 8.

(ii) Element Y with atomic number 18 is Argon. Argon is a noble gas and it is often used in lighting and other high-energy devices. One of its most common uses is in fluorescent and other types of lighting because it doesn't react with the filament in a light bulb even under high temperature. It is also used in welding to provide an inert atmosphere that protects the weld from oxidation.

2.The atomic number of an element Y is 18(i) Write down its electronic arrangement.........................................................................................................................(ii) Give one use of elementY

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