Elements in a group have similar properties.
<span>strontium, magnesium, calcium, beryllium are the answers because they belong to same group (2nd group).
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The explanation is in the picture
There are 150 neutrons in Uranium-242
In one mile of water there will be 6.02.1023 water molecules. So, there will be a total of 6.02.1023.2= 1.2.1024 hydrogen atoms
