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Question
Fill in the blank of the following statement :
All the mass of an atom is concentrated in a small region of space called the ___________.
Solution
All the mass of an atom is concentrated in a small region called the nucleus.
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Multiple Choice Questions
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From the symbol `""_2^4"He"` for the element helium, write down the mass number and the atomic number of the element.
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Atomic no. = 1
Mass no. = 1
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Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.
Name the 3 sub-atomic particles of an atom.
What are the letters A, Z, and X stand for?
If M is the atomic mass and A is the mass number, then packing fraction is given by ______.
State the term for the following:
The amount of substance which contains the same number of units as the number of atoms in carbon-12.
