EASY
9th CBSE
IMPORTANT
Earn 100

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)

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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
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.

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.  What is its atomic number?