EASY
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The symbol of neutron is represented by:

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Important Questions on Inside the Atom

EASY
Mass number of an element is 37 and number of protons is 17. The element has:
EASY
An atom of an element has 9 protons and 10 neutrons, its mass number is:
EASY
Write the electronic configuration of oxygen and magnesium.
MEDIUM
An atom of an element has two electrons in outermost M shell. State its 
(a) Electronic configuration
(b) Number of protons 
(c) Atomic number
(d) Valency
(e) Nature whether metal or non-mental 
(f) Name.
MEDIUM
Atomic-number of sodium is 11. Electronic distribution of Na+ is:
EASY
Define the term mass number.
MEDIUM

What is mass number of an element? How is the mass number related to the protons and neutrons present in the nucleus of an atom? Is it same as atomic number?

MEDIUM
Compare a proton and a neutron in respect of charge and mass.
EASY
According to Bohr, maximum number of electrons in a shell is given by
EASY
Explain with examples; mass number. 
EASY
The electronic distribution of Mg (atomic number 12) is:
EASY
The ion of an element has 2 positive charge. Mass number of the element is 24 and number of neutrons is 12. What is the number of electrons in the ion?
MEDIUM
Write the distribution of electrons in carbon and sodium atoms. 
EASY
A nitrogen atom contains 7 protons, 7 electrons and 7 neutrons. Why is it that the atomic mass of nitrogen is 14 and not 21?
MEDIUM
Mass number of an element is 40 and it has 18 protons, number of neutrons in the atom is:
EASY
State the locations of protons, electrons and neutrons in an atom.
HARD
State 2n2 rule of Bohr and Bury. Draw diagrams indicating the distribution of electrons in an atom of the elements having atomic number 8, 15 and 17. Give the names and symbols of these elements.
EASY

Define the term: mass number 

MEDIUM
The number of electrons in an element X is 9 and number of neutrons 10. The correct representation of X is: