Which statement is true about the elements present in a pure substance?
2 answers:
Answer: Option (D) is the correct answer.
Explanation:
An element is defined as a substance that contains atoms of one type.
For example, a piece of sodium metal will contain only atoms of sodium.
Therefore, it is a pure substance. Whereas a compound is a substance that consists of two or more different atoms in similar composition.
For example, is a compound.
When elements change into compounds then they tend to change their chemical properties.
Hence, we can conclude that the statement they can only be separated by chemical methods, is true about the elements present in a pure substance.
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Answers:
See attached table
Explanation:
The isotope symbol will have the mass number and chemical symbol. The atomic number will be equal to the number of protons because the atomic number is the number of protons in an atom. The electrons will be equal to the protons because the atom is neutral. The neutrons can be found by subtracting the number of protons from the mass number. The mass number can be found by adding the protons and neutrons. It is also in the name of the isotope.
