Helium has atomic number 2. That means the helium atom has 2 protons and two electrons.
The standard atomic weight of helium is 4.002602, or 4.003 rounded to 3 decimal places.
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2.
==new answer== The number two means receptivity or duality.
Twice a number means to multiply the number by 2
A number's opposite is the negitave of that number... the opposite of 2 is -2, the opposite of 947283 is -947283.
It means u multiply in by the number in the brackets EX- 2(3)= 2*3= 6