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M IS A LETTER but N is a letter
The alpha particle is the helium nucleus.
The mass of helium nucleus (⁴₂He) is 4u.
The mass of radioactive atom decreases by 4u. Look at the reaction below:
²²³₈₈Ra ---> ⁴₂He + ²¹⁹₈₆Rn
Ernest Shackleton's South! primarily uses the writing structure of "problem and solution".
Yes, because cotton is a plant and then the cotton is then made into a ball of yarn.
