EASY
9th CBSE
IMPORTANT
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Isotopes of an element have similar chemical properties because their are similar.
 

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Important Questions on Structure of Atom

EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 9
Fill in the blanks with correct word given in the bracket.
Isotopes have same atomic numbers because number of _____ in their nuclei is same. (protons / neutrons)
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 9
Isotopes of an element are electrically neutral because they contain equal numbers of protons and _____.
MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 9
In the species X1735 there are _____ neutrons. 17 / 18
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 9
The isotope _____ of carbon is radioactive. (C-12 / C-14 / C-13)
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 9
The species  Z1840 and  K1940 represent a pair of _____. 
 
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 1
Write the electronic configuration of chlorine atom (atomic number 17) and calculate the number of electrons in the outermost shell.
MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 2
Calculate the number of valence electrons in an atom whose atomic number is 16.
MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Problems for Proficiency>Q 3

The nucleus of a neutral atom A has 7 protons. Write the electronic configuration of A.