Multiply the number by 1/5 or 0.2
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To find 5% of a number, you can multiply the number by 0.05. This is because 5% is equivalent to 0.05 in decimal form. For example, to find 5% of 100, you would calculate 100 x 0.05 = 5.
You can determine if a plastic item is made of polyethylene or polypropylene by looking for the recycling symbol on the item. Polyethylene is usually labeled with the number 2 inside the recycling symbol, while polypropylene is labeled with the number 5.
If you have both the mass number and atomic number you can figure it out, since the atomic number is the number of protons. Say the mass number is 13 and the atomic number is 8. 13-8 is 5, so you would have 5 neutrons.
the atomic number is determined by the number of protons in a nucleus.
Count the number of species, and determine their relative abundance.////Apex
Atomic number is same as the number of protons and number of electrons.