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Chemistry
4. Structure of the Atom
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Q23 of 64 Page 110

The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?

Any element is represented symbolically as:



Here mass number = 15 +16 =31


Atomic number = number of protons =15


Hence, the correct representation of the element with 15 electrons and 16 neutrons is .


Hence, the correct option is – A

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21

The presence of protons and neutrons at the centre of the atom was suggested by:

22

The presence of electrons outside the nucleus and nucleus at the centre of the atom was suggested by:

24

Dalton’s atomic theory successfully explained:

(i) Law of conservation of mass


(ii) Law of constant composition


(iii) Law of radioactivity


(iv) Law of multiple proportion

25

The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

Questions · 64
4. Structure of the Atom
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