Question

₱ⱠɆ₳₴Ɇ ₳₦₴₩ɆⱤ ₮Ⱨł₴ ₣₳₴₮
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Answer 1

Explanation:

Q.2) An atom is the smallest unit of an element that can or cannot exist freely .

A molecule is made up of two or more different or identical atoms that are combined chemically.

Q 3) The physical properties of an compound are often quite different to the physical properties of the elements that made them up. This is because the shape and composition of the molecule has changed, which changes its physical properties.

The chemical properties change because what determines a substance's chemical property is how many electrons it has. The alkaline metals are very reactive because they only have on electron in their outer shell and wants to lose that electron. The Noble gases are very stable because their electron shells are full and does not want to react with anything. Take table salt (NaCl) for an example, sodium metal (Na) has 1 electron in it's outer shell (shell 3) and it wants desperately to get rid of it, that is why it is so reactive. Chlorine gas (Cl) has 7 electrons in its outer shell (shell 3) and wants to gain an electron to fill its outer shell. That makes chlorine extremely reactive as well. But when sodium and chlorine bonds together, the sodium shares an electron with the chlorine atom making an stable compound because none of them has any more loose electrons to react easily.

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Answer 2

Explanation:

1. Atom is the smallest unit of an element that can or cannot exist freely. ... Moreover, an atom contains a nucleus (made up of neutrons and protons) and electrons. While on the contrary, a molecule is made up of two or more different or identical atoms that are combined chemically.

2. Compounds have different properties from the elements that make them. The atoms of different elements are held together in compounds by chemical bonds. Chemical bonds can hold atoms together in large networks or in small groups. Bonds help determine the properties of a compound.