Dengan menggunakan hukum kekekalan nomor massa, maka

<img align="middle" alt="sum m subscript k i r i end subscript equals sum m subscript k a n a n end subscript
14 plus 4 equals m plus 1
18 equals m plus 1
m equals 18 minus 1
m equals 17" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mo»§#8721;«/mo»«msub»«mi»m«/mi»«mrow»«mi»k«/mi»«mi»i«/mi»«mi»r«/mi»«mi»i«/mi»«/mrow»«/msub»«mo»=«/mo»«mo»§#8721;«/mo»«msub»«mi»m«/mi»«mrow»«mi»k«/mi»«mi»a«/mi»«mi»n«/mi»«mi»a«/mi»«mi»n«/mi»«/mrow»«/msub»«mspace linebreak=¨newline¨/»«mn»14«/mn»«mo»+«/mo»«mn»4«/mn»«mo»=«/mo»«mi»m«/mi»«mo»+«/mo»«mn»1«/mn»«mspace linebreak=¨newline¨/»«mn»18«/mn»«mo»=«/mo»«mi»m«/mi»«mo»+«/mo»«mn»1«/mn»«mspace linebreak=¨newline¨/»«mi»m«/mi»«mo»=«/mo»«mn»18«/mn»«mo»-«/mo»«mn»1«/mn»«mspace linebreak=¨newline¨/»«mi»m«/mi»«mo»=«/mo»«mn»17«/mn»«/math»" height="116" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJIAAAB0CAYAAABuZmsRAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAA5nyEalgAABZlJREFUeNrtnVGEXUcYx48VsSpKHqKiolT0IQ8r9KFWVC1VVX1YoSqqqpa1KvpUog+Vp1JVeehbRVVEhYqIVdGXioqoZVVV1QrVh6jIS0RUrVW289nvdien59x7Zs7M3Jlzfz8+7j3nzj3n/OfbOd/cnf+9VfU4uz1jVkAnBEKnFKxYF3vBQ9xZAZ068IqJR3rB6ybmEQidfDlh4k+96E0TRypAJ0+eUnFEpLsqGqCTF0/osC0iPdThHNDJmwsq0j9aaLpw3sQ5/cv93MR9E/dMvKb7D+v7P9Ca40N0Gq5OZ6xZypeObb9RkTb1fQ6YeMbEHyaOmvjBxJu6/ZiJbRVz2tN3dIpQUD6yCsp5x/Z3THyvf1E2UqRebNl+tNDCG51aOKQXuKtD6jHH9nMm/tYawmV7aaDTBK5bQ7VPAfmCiZsBtud+axuqTkE4Z4lzvkfN8FXP7aMidFyBWnnunxWdpsZLljjf9ngfmX2s9twuRehypn9s6DSGp3XqKeL83lDkuXDNmr76br+j5yQsaoeNPkHesuoRefy6Dvnb2mbLo14Zok4y+7thYkcnBKdrmm3qPntE82nzHzK1/FHFkWJuwbHuqPOgZfbSdbtdVMrnMuta2Nb3zelnNzK7OZ6gIC1Jp8P6EcIb+rr3dEQbaXZZE/Ckvq9vm8f4whqq3/IoYEMjReUtPa/LeiFNBac8vp2wIC1Jpw9MfFqrpd7WNpvW9lP68YNvG+fZTMp1NlJUXtWTf2dMwdlUfLYVqqlmfbnodLV2G5Tnr2qbSy16+bTJWqBRUXlEa4DFloKzqfhsK1SHmEjjdLpifSQhI9VfJp7UNmu191jp0SZr7KLyWRO/Vvv/FrD3NRWfbYXqEBmn07Le7iq9PT1s0ee69dynTdbUi8pFrXvma/uaitK2QnWIjNNJeLna+yfvKZ2QrDa0qT/3aQMzxAGN2G0AAAAAAAAAAAAAAAriORMfmfi54+tlpVyqL0VIeayS+iBL5D++qx07TFbg/Zaoc1Meq6Q+yJ4uFyGr8VY8LthHIN9jlaJlyHZFXby9xDJ2IvU5lguxvPckUgsHTfxS7bkMYieS67H6rE6M5b0nkVr4xMTZHhfs8vq+x3IhlveeRGpAbDe3HS/Yd5TwOZYvIb33odZsDzqRNqp931jsEcnnWL6dGNN7z4jk0VEhBUrpxAjhvSeRel7EbkKBYokbwntPIpFIQbz3JNKE20lOFxzrWH2999PuAwAAAAAAAAAAAAAAAAAYCF08VbJaUJZRyDedyrrl76r9b5yfZV3AoounSn7Q7uNqbxG8LM6XddUb6AJNjBNsu/Zc1i/vDOj6YrQjkRqQW9qhWiLdjXQeeM0GnEjSoe9bz+U7nT+b8F54zUik/7Ggt7Id7UgZIV6MdB54zQaaSDIafK2ddVC3PV/t/V7ZQuBzwGs24ES61pIwS1W7zwuvGYk0ccbWdZ8PeM0GnEjyHUXHG7af0FopJHjNBpxIpzWZlrQmmdPHUiOtBT4HvGaFJ9Ck+kV+5/QnnbVt68wtxq874zUDAAAAAAAAAAAAAAAAAJgCOXrr8LUVSI7eOnxtBZOjt45E6kAsD1mMTkvprSORHAnlIUvh2HD11pFICYnlIYvRaSm9dSSSAyE9ZLE7zcdbh68tESE9ZLE7zcdbx4iUiJgestCdltJbRyI5EtNDFrrTUnrrSCRHYnrIQndaSm8dieRIaR6yVN46l3MCAAAAAAAAAAAAAAAAABgEkzxkIRbNwQzg6yGTFQEXkQ+aRp6uiJvlVhVvaQs4UJKvrc66iZN0YR6U5GuzWdOaCjKhJF/bCEn0DU1uyICSfG02Mkou0X35UJKvzZ6l3aDr8qIkX9toRNyiwM6PknxtwrLe1iAzSvK1CVdMvEu35Udpvrb7DbNImCL/Auz4t5vJ4sWvAAACTXRFWHRNYXRoTUwAPG1hdGggeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzE5OTgvTWF0aC9NYXRoTUwiPjxtbz4mI3gyMjExOzwvbW8+PG1zdWI+PG1pPm08L21pPjxtcm93PjxtaT5rPC9taT48bWk+aTwvbWk+PG1pPnI8L21pPjxtaT5pPC9taT48L21yb3c+PC9tc3ViPjxtbz49PC9tbz48bW8+JiN4MjIxMTs8L21vPjxtc3ViPjxtaT5tPC9taT48bXJvdz48bWk+azwvbWk+PG1pPmE8L21pPjxtaT5uPC9taT48bWk+YTwvbWk+PG1pPm48L21pPjwvbXJvdz48L21zdWI+PG1zcGFjZSBsaW5lYnJlYWs9Im5ld2xpbmUiLz48bW4+MTQ8L21uPjxtbz4rPC9tbz48bW4+NDwvbW4+PG1vPj08L21vPjxtaT5tPC9taT48bW8+KzwvbW8+PG1uPjE8L21uPjxtc3BhY2UgbGluZWJyZWFrPSJuZXdsaW5lIi8+PG1uPjE4PC9tbj48bW8+PTwvbW8+PG1pPm08L21pPjxtbz4rPC9tbz48bW4+MTwvbW4+PG1zcGFjZSBsaW5lYnJlYWs9Im5ld2xpbmUiLz48bWk+bTwvbWk+PG1vPj08L21vPjxtbj4xODwvbW4+PG1vPi08L21vPjxtbj4xPC9tbj48bXNwYWNlIGxpbmVicmVhaz0ibmV3bGluZSIvPjxtaT5tPC9taT48bW8+PTwvbW8+PG1uPjE3PC9tbj48L21hdGg+1V1P6AAAAABJRU5ErkJggg==" style="max-width: none; vertical-align: -59px;" width="146" />

Dengan menggunakan hukum kekekalan nomor atom (proton), maka

<img align="middle" alt="sum p subscript k i r i end subscript equals sum p subscript k a n a n end subscript
7 plus 2 equals p plus 1
9 equals p plus 1
p equals 9 minus 1
p equals 8
" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mo»§#8721;«/mo»«msub»«mi»p«/mi»«mrow»«mi»k«/mi»«mi»i«/mi»«mi»r«/mi»«mi»i«/mi»«/mrow»«/msub»«mo»=«/mo»«mo»§#8721;«/mo»«msub»«mi»p«/mi»«mrow»«mi»k«/mi»«mi»a«/mi»«mi»n«/mi»«mi»a«/mi»«mi»n«/mi»«/mrow»«/msub»«mspace linebreak=¨newline¨/»«mn»7«/mn»«mo»+«/mo»«mn»2«/mn»«mo»=«/mo»«mi»p«/mi»«mo»+«/mo»«mn»1«/mn»«mspace linebreak=¨newline¨/»«mn»9«/mn»«mo»=«/mo»«mi»p«/mi»«mo»+«/mo»«mn»1«/mn»«mspace linebreak=¨newline¨/»«mi»p«/mi»«mo»=«/mo»«mn»9«/mn»«mo»-«/mo»«mn»1«/mn»«mspace linebreak=¨newline¨/»«mi»p«/mi»«mo»=«/mo»«mn»8«/mn»«mspace linebreak=¨newline¨/»«/math»" height="119" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -50px;" width="136" />

Reaksi inti berikut ini akan lengkap jika inti X adalah....

<img align="middle" alt="N presubscript 7 presuperscript 14 space plus space H presubscript 2 presuperscript 4 e space plus space 1 comma 2 space M e V space rightwards arrow space X space plus space H presubscript 1 presuperscript 1" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mmultiscripts»«mi»N«/mi»«mprescripts/»«mn»7«/mn»«mn»14«/mn»«/mmultiscripts»«mo»§#160;«/mo»«mo»+«/mo»«mo»§#160;«/mo»«mmultiscripts»«mi»H«/mi»«mprescripts/»«mn»2«/mn»«mn»4«/mn»«/mmultiscripts»«mi»e«/mi»«mo»§#160;«/mo»«mo»+«/mo»«mo»§#160;«/mo»«mn»1«/mn»«mo»,«/mo»«mn»2«/mn»«mo»§#160;«/mo»«mi»M«/mi»«mi»e«/mi»«mi»V«/mi»«mo»§#160;«/mo»«mo»§#8594;«/mo»«mo»§#160;«/mo»«mi»X«/mi»«mo»§#160;«/mo»«mo»+«/mo»«mo»§#160;«/mo»«mmultiscripts»«mi»H«/mi»«mprescripts/»«mn»1«/mn»«mn»1«/mn»«/mmultiscripts»«/math»" height="23" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -7px;" width="257" />

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