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Question
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
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Solution
The total number of protons and neutrons in the nucleus of an atom is called its mass number.
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Write true or false for the following statement
An atom on the whole has a positive charge.
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The sub atomic particle with negative charge is
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
(a) Which of the nuclear particles is present in the same fixed number in the atoms of any particular element?
(b) What do we call this number which is characteristic of a particular element?
From the symbol `""_12^24"Mg"`
, state the mass number, the atomic number and electronic configuration of magnesium.
State why the atomic weight of an element is also termed relative atomic mass.
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Do isotopes have the same atomic number or the same mass number?
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Lithium [At. no. = 3, Mass no. = 7]
Explain the following terms.
- Proton
- Electron
- Neutron.
An element has 2 electrons in its N shell.
What is its atomic number?
