MEDIUM
9th CBSE
IMPORTANT
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What is the number of valence electrons in chlorine atom? (Write answer in number(s))

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Important Questions on Structure of the Atom

MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 36

Identify the pair of isotopes from the following:

X816, X716, X817

MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 37
There are 15 protons and 16 neutrons in the nucleus of an element. Calculate its atomic number and mass number.
MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 38
Why is Thomson's model of an atom compared with watermelon?
MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 39
Why do isotopes have different mass numbers?
MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 40
The number of electrons in the outermost shell of chlorine is 7. What is its valency and why?
MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 41
Write one pair of isobars
MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 42
List any two postulates of Bohr's model of an atom.
MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 42
Draw a sketch of Bohr's model of an atom with four shells.