Question

building block of universe?
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Answer 1

Answer:

(The property Building Blocks of the Universe that identifies an atom is the number of protons in its nucleus; different isotopes of an element possess the same number of protons in the atomic nucleus, but differing numbers of neutrons.

Explanation:

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Answer 2

Answer:

The property Building Block of the Universe that identifies an atom is the number of protons in its nucleus: different isotopes of an element posses the same number of protons in the atomiy nucleus but different number of neutrons.