HARD
9th CBSE
IMPORTANT
Earn 100

If bromine atom is available in the form of two form isotopes 49.7% X3579 and 50.3% Br3581 what is the average atomic mass of Br.

Important Questions on Structure of Atom

EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 1
Name an element that has two shells each one of which is completely filled with electrons.
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 2
Name the element which has the electronic configuration 2, 8, 3.
 
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 3
Name an element which has a total of three shells and there are four electrons in its valence shell. (Carbon/Silicon)
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 4
Name the element which has one electron, one proton and no neutron.
 
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 5
Name an element which has a total of two shells and there are three electrons in its valence shell. What is the atomic number of this element?
 
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 6
Name an element which has twice as many electrons in its second shell as in the first shell.
HARD
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 7
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of X816 and X818 in the sample?
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 4 - Structure of Atom>Questions on Higher Order Thinking Skills (HOTS)>Q 8
The electronic configuration of an element X is 2, 8, 7
What is the atomic number of the element X?