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Nuclear decay is a natural phenomena. Natural uranium 238/235 decays because its nucleus is unstable, potassium 40, carbon 14, they are all naturally occurring and they decay on their own. Others are man made and are very useful
Answer:
Note about significant digits:
1. Both isotope mass figures, 111.9 amu and 115.9 amu, have 4 signficant digits.
2. You can assume that the relative abundance (93.5% and 6.5%) are exact to the extense that they do not affect the precision of the measures, so the result will contain the same number of significant digits as the isotope mass, i.e. 4
Entry (answer)
50 ← atomic number
Sn ← chemical symbol
112.2 ← atomic mass
Explanation:
Table of data
Mass spectroscopic analysis
Isotope mass relative abundance
(amu)
¹¹²Sn 111.9 93.5%
¹¹⁶Sn 115.9 6.5%
Then entry in the periodic table consists of the chemical symbol (Sn), the atomic number above the symbol, and the atomic mass below the symbol.
<u>1) Atomic number</u>
The atomic number is the same in any planet, as it is the number of protons and identifies uniquely the element. So, tin (Sn) has 50 protons in any place and the atomic number is 50.
<u>2) Atomic mass</u>
Atomic mass is the weigthed average of the atomic masses of the element in its nature state; so it depends of the relative abundance, and si calculated with this formula:
- atomic mass = ∑ (relative abundance × atomic mass) of each isotope.
- atomic mass Sn = %¹¹²Sn × relative abundance ¹¹²Sn + %¹¹⁶Sn × relative abundance ¹¹⁶Sn
- atomic mass Sn = 93.5% × 111.9 amu + 6.5% × 115.9 amu = 112.16 ≈ 112.2 amu
To keep 4 significant figures the number 112.16 hast to be rounded the closest number with one decimal, which is 112.2 (112.16 is closer to 112.2 than to 112.1)
When earth first formed it was likely composed of hydrogen, helium and other gases that contained hydrogen but it didnt last for very long because the solar wind from the sun blew it away solar wind is stream of charged particles such as electrons, protons, and aloha particles. We now have a magnatic field surrounding earth that sheilds us from the solar wind