Question

Answer in short.
2 Classify matter
2. Describe pure substances.
3. How are elements classified on the basis of their properties?
4 Define an atom. Can atoms exist independently?
5. Why are noble (inert) gases named so?​

Answer 1

Answer:

1. Classify matter as an element, compound, homogeneous mixture, or heterogeneous mixture with regard to its physical state and composition.
2. A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.
3. The elements are sometimes grouped according to their properties. One major classification of the elements is as metals, nonmetals, and metalloids. ... In the periodic table the elements are arranged in order of increasing atomic weight in such a way that the elements in any column have similar properties.
4. An atom is the smallest particle of the element that can exist independently and retain all its chemical properties. A molecule is the smallest particle of an element or a compound capable of independent existence under ordinary conditions.
5. The science. The noble gases, in order of their density, are helium, neon, argon, krypton, xenon and radon. They are called noble gases because they are so majestic that, in general, they don't react with anything. For this reason they are also known as inert gases.

Explanation:

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Answer 2

Answer:

1. Matter can be classified according to physical and chemical properties. Matter is anything that occupies space and has mass. The three statements of matter and solid,liquid and gas. A physical change involves the conversion of a substance from one state of matter to another , without changing its chemical composition.

2. A substance that had a fixed chemical composition throughout is called a pure substance such as water,air and nitrogen. A pure substance does not have to be of a single element or compound.

3. Elements having the similar electronic configuration that is in the outer most shell are placed in the same group Hence elements are arranged according to their properties.Hence given statement is true.

4.An atom is the smallest particle of the element that can exist independently and retain all its chemical properties. A molecule is the smallest particle of an element or a compound capable of independent existence under ordinary conditions.

5. The science. The noble gases, in order of their density,are helium, neon, argon, krypton, xenon and radon. They are called noble gases because they are so majestic that, in general, they don't react with anything. For this reason they are also known as inert gases.

Explanation:

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