Sodium atom and sodium ion:

are chemically the same

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have the same number of protons

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have the same number of electrons

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react spontaneously with water

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Solution

The correct option is A have the same number of protons
$(B)$ have the same number of protons.

$R e a s o n$ : A sodium atom and sodium ion, both have the same nucleus (same number of protons and neutrons).The only difference is that the ion has one less electron than the atom.

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Sodium atom and sodium ion:

The correct option is A have the same number of protons(B) have the same number of protons.Reason : A sodium atom and sodium ion, both have the same nucleus (same number of protons and neutrons).The only difference is that the ion has one less electron than the atom.

The correct option is A have the same number of protons
$(B)$ have the same number of protons.

$R e a s o n$ : A sodium atom and sodium ion, both have the same nucleus (same number of protons and neutrons).The only difference is that the ion has one less electron than the atom.