Element Chemistry Example 3

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Example 3

easy
Classify each as an element or compound: (a) Na\text{Na}, (b) CO2\text{CO}_2, (c) Ne\text{Ne}, (d) NaCl\text{NaCl}.

Solution

  1. 1
    Check whether each substance contains one type of atom or multiple types.
  2. 2
    (a) Na — one type of atom → element. (b) CO2\text{CO}_2 — carbon and oxygen → compound. (c) Ne — one type → element. (d) NaCl — sodium and chlorine → compound.

Answer

Elements: Na, Ne. Compounds: CO2, NaCl.\text{Elements: Na, Ne. Compounds: CO}_2\text{, NaCl.}
Elements consist of a single type of atom, while compounds are chemical combinations of two or more different elements.

About Element

A pure substance consisting entirely of atoms with the same number of protons (same atomic number), which cannot be broken down into simpler substances by.

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More Element Examples

Example 1 easy

Explain why gold (Au) and oxygen (O) are considered elements, while water ([formula]) is not.

Example 2 medium

Iron (Fe) has atomic number 26. How many protons and electrons does a neutral iron atom have? If iro

Example 4 medium

Sample A has atoms with 8 protons and 8 electrons. Sample B has atoms with 8 protons and 10 electron

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