Atoms/Molecules/Ions

2007-09-29 5:47 am

How can I distinguish whether the substance consists ion, atoms, or molecules?
Pls help me out with the following questions with explanation
Thank You very much!
1) Bromine
2) Zinc
3) Carbon dioxide
4) Magnesium sulphate
5) Carbon
6) Sulphur dioxide
7) Sodium
8) Potassium Sulphide

回答 (1)

用戶205602

2007-09-29 7:43 pm

✔ 最佳答案

1) Bromine is a molecule because it is a diatom.

2) Zinc is an atom because it is only one particle.

3)Carbon dioxide is a molecule because there is covalent bond between the C and O. CO2 has the structure of O=C=O

4)Magnesium sulphate is consists of Mg^2+ and SO4^2- ion.

5) Carbon is an atom, single particle.

6) Sulphur dioxide molecule, covalent bonding between S and O.

7) Sodium atom, single particle.

8) Potassium Sulphide, consists of K^+ and S^2-

In conclusion whenever you see something directly out of the periodic table are atoms (except the diatomic N, O, F, Cl, Br, I). If everything in the formula is non-metal, it is a molecule. If there is metal and non metal parts in the formula, it consists of positively charged metal and negatively charged non metal.

參考: college textbook

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