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(A) The fact that atoms are divisible is supported by the following observations:$1$. Discovery of subatomic particles: The discovery of electrons by

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Discovery of subatomic particles like electrons and protons.

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(A) The fact that atoms are divisible is supported by the following observations:$1$. Discovery of subatomic particles: The discovery of electrons by $J$.$J$. Thomson and protons by $E$. Goldstein proved that atoms are composed of even smaller particles.$2$. Existence of isotopes and isobars: The existence of different forms of the same element (isotopes) and different elements with the same mass number (isobars) suggests that the internal structure of the atom is complex and divisible.

	$X$	$Y$
Protons $=$	$6$	$6$
Neutrons $=$	$6$	$8$

Write any two observations which support the fact that atoms are divisible.

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