Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 11

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${}_{17}^{35}P$ ; ${}_{16}^{32}Q$ ; ${}_{17}^{37}R$ ; ${}_{15}^{31}S$ are four elements. The pair of elements which are isotopes:

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Important Questions on Structure of Atom

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9th CBSE

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 12

The number of valence electrons in fluoride

(F^{-})

ion is:

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

The number of valence electrons in aluminium ion

({Al}^{3 +})

is:

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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: