MEDIUM
9th CBSE
IMPORTANT
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Which of the following represents the correct electron distribution in magnesium ion?
(a)
(b)
(c)
(d)

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Important Questions on Structure of Atom
MEDIUM
9th CBSE
IMPORTANT
The correct electronic configuration of a chloride ion is :

EASY
9th CBSE
IMPORTANT
Goldstein's experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of :

MEDIUM
9th CBSE
IMPORTANT
The number of electrons in the atom of an element X is and the number of neutrons is . Which of the following is the correct representation of an atom of this element?

MEDIUM
9th CBSE
IMPORTANT
The ion of an element has positive charges. The mass number of an atom of this element is and the number of neutrons is . What is the number of electrons in the ion?

EASY
9th CBSE
IMPORTANT
The first model of an atom was given by :

EASY
9th CBSE
IMPORTANT
Which of the following statement is always correct ?

EASY
9th CBSE
IMPORTANT
From the symbol , state mass number of phosphorus. (Give the answer in numerals)

EASY
9th CBSE
IMPORTANT
From the symbol , state atomic number of phosphorus. (Give the answer in numerals)
