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9 November, 05:41

41. Explain the difference between homogenous and heterogeneous mixtures.

42. What is the difference between atomic number of an element and its mass number?

43. The Big Bang Theory does not try to explain how the universe was created. What does it explain?

44. Why do isotopes of elements have the same atomic number but different mass numbers?

45. Why does Earth's moon lack an atmosphere?

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  1. 9 November, 06:21
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    The moon does not have an atmosphere because it is not a planet. It is just a big lump of rock that has a core. It was created from the Earth.
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