Question

the ..................of an atom is very hard and dense​

Answer 1

Answer:

The nucleus is made up of protons and, in most cases, neutrons. Almost all of the mass (more than 99%) of an atom is contained in the dense nucleus.

Explanation:

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Answer 2

Answer:

The nucleus

Explanation:

The nucleus is made up of protons and, in most cases, neutrons. Almost all of the mass (more than 99%) of an atom is contained in the dense nucleus.

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