Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 13

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The number of valence electrons in aluminium ion $({Al}^{3 +})$ is:

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Important Questions on Structure of Atom

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 14

The gas which produces canal rays, which only consist of protons, is:

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 15

With the exception of helium, the valence shell of an atom can have maximum of:

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 16

An element is considered as metal, if it has _____ electrons in its valence shell.

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 17

An element is considered as non-metal, if it has in its valence shell:

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 18

With the exception of helium, all noble gases have in their valence shell

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 19

When an atom changes into an ion, it acquires the stable electronic configuration of:

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 20

Maximum and minimum number of electrons which can be accommodated in the outermost and innermost shell of an atom respectively are:

(Upto atomic number $18$ )

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 21

The number of valence electrons in an alkali metal is: