Why atomic number is considered very important to know about the chemical behaviour of an elementS
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it tells you the number of protons in the nucleus, hence it determines the positive charge on the nucleus. ... now chemical behaviour depends on the repulsive and attractive forces generated by the protons and electrons. so the arrangement of electrons, the number of shells and the valency also matters.
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The atomic number is equal to the number of protons in an atom. It is also equal to the number of electrons. so, it determines the positive and negative charge of an atom. The chemical behaviour depends on the repulsive and attractive forces generated by the protons and electrons. Hence, the atomic number is considered very important to know the chemical behaviour of an element.
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