Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 31

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The general name of elements having $8$ valence electrons 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 32

Which of the following is a metal which has two valence electrons?

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 33

Select a pair of isotopes from the following list:

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 34

Isotopes of an element have:

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 35

Inert gases from the following list are:
List:

H, He, Na, Ne, Au, Ar, K, Kr

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 36

Isotopes of an element are electrically neutral because they have same number of:

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 37

The element

{}_{20}^{40}{Ca}

forms Ca²⁺ ions. The electronic configuration of Ca²⁺ ion and its resemblance to noble gases is:

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 38

The electronic configuration of oxygen atom [

{}_{8}^{16}O

] and [O^2- ] ion are respectively:

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 39

A charged particle has 16 protons, 18 electrons and 16 neutrons. The particle is: