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3 years ago

An unknown substance is made only of identical atoms that cannot be broken down. This substance is a ________.

Chemistry

2 answers:

kherson [118]3 years ago

8 0

Answer: Element

Explanation:

Element is a pure substance which is composed of identical atoms. It can not be decomposed into simpler constituents using chemical reactions.Example: Silver $(Ag)$

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: carbon dioxide $(CO_2)$

Thus an unknown substance is made only of identical atoms that cannot be broken down is an element.

Veseljchak [2.6K]3 years ago

7 0

The substance is an element off of the periodic table.

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Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Mg is having an oxidation state of +2 called as $Mg^{2+}$ cation and $S^{2-}$ is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $MgS$ . Also $Mg^{2+}$ cation and $Br^{-}$ can combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $MgBr_2$ .

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