Complete the following table. The first row has been completed as an example. Symbol
Atomic number Mass number Number of protons Number of neutrons
17C1
17
37
17
20
238
U
92
92
238
146
92
325
16
32
16
16
5 Fe
54
26
I
19
1.K
41
22
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because all chemical reaction involve the rearrangement of atoms, the mass is an electron is negatively charged, it has a mass approximately 1/2000 that of a, Atoms of an element that contain the same number of protons but a different Copy and complete the following tables concerning the isotopes of silicon SI-28.

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organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.