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Nuclear fusion produces certain isotopes of the lighter elements, ranked by atomic number from helium (2) up to zinc (30). When elements up to iron (26) are fused with a helium nucleus (alpha particle) or a deuterium, they release energy, and this energy helps the star continue with more fusion reactions. The isotopes of cobalt (27), nickel (28), copper (29), and zinc (30) produced by fusion are not stable and decay back into lighter elements. Iron-56 (atomic number 26) is the heaviest stable isotope produced by exothermic fusion and subsequent decay.
Our sun produces mostly helium by fusion, but it also uses fusion to make lithium, beryllium and boron. Temperature and mass determine how far a star can go with fusion. Our sun has a core temperature less than 16 million degrees Kelvin. In a star where fusion results in iron, the core temperature has to be over 2.5 billion degrees Kelvin, and this only happens in the final hours or days of the massive star's life, which then ends in a type II supernova. Half the elements with atomic numbers higher than iron are produced during the days- or months- long explosion, but it's not nuclear fusion doing it (which is exothermic), but rather processes known as nuetron capture or proton capture(which are endothermic).
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoAll of them except Hydrogen (and some of the Helium which was made earlier but losts is made in the fusion process in stars). Of course there are some that are not ever made in nature:
Technetium Tc 43
Promethium Pm 61
Astatine At 85
Francium Fr 87
Neptunium Np 93
Plutonium Pu 94
Americium Am 95
Curium Cm 96
Berkelium Bk 97
Californium Cf 98
Einsteinium Es 99
Fermium Fm 100
Mendelevium Md 101
Nobelium No 102
Lawrencium Lr 103
Rutherfordium Rf 104
Dubnium Db 105
Seaborgium Sg 106
Bohrium Bh 107
Hassium Hs 108
Meitnerium Mt 109
Darmstadtium Ds 110
Roentgenium Rg 111
Ununbium Uut 113
Ununtrium Uuq 114
Ununpentium Uup 115
Ununhexium Uuh 116
Ununoctium Uuo 118
Wiki User
∙ 12y agoDepending on the size of the star and its position in the stellar lifecycle, the element(s) formed in its core are:
- Helium
- Carbon
- Nitrogen-Oxygen
- Neon
- Oxygen
- Magnesium
- Nickel-Iron
Between forming Carbon and forming Nickel-Iron, it is possible for stellar fusion to form limited quantities of most elements heavier than Carbon and lighter than
Nickel-Iron, but the ones listed above are the dominate products formed in sequence over the life of the star. Elements heavier than Helium but lighter than Carbon are unstable in the conditions inside a star and cannot be formed.
Wiki User
∙ 13y agoAs far as I know only helium is formed in the sun, but the next heavier element is lithium
Wiki User
∙ 11y agoAll elements heavier than hydrogen can be formed by fusion, given enough energy.
Wiki User
∙ 13y agohydrogen
Wiki User
∙ 14y agoHydrogen
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Is helium inside a balloon a compound?
Helium is not a compound; it's a single element in its gaseous form.
Helium can combine with what to form new substances?
helium does not combine with any element
Explain why helium does not react with other element to form a compounds?
why helium does not react with other elements to form compounds
Is helium a compound or an element?
Helium is an element.
Is helium an element mixture or compound?
Helium is an element. It is a noble gas. It is in the 18th period.
When hydrogen fuses with hydrogen what new element does this produce?
When hydrogen is fused in the suns core Helium is produced.
Is helium a form of matter?
Helium is a gaseous chemical element.
Why helium is an element?
Helium is an element because it contains only one atom in its simplest form.
What element is transformed in nuclear fusion in the sun's core?
We understand that hydrogen atoms are fused into helium in the sun's core.
Is helium inside a balloon a compound?
Helium is not a compound; it's a single element in its gaseous form.
What percent of hydrogen is fused to helium in the sun and what percent is fused to energy?
99.993 % into Helium, .007 % into energy.
What role does hydrogen play in nuclear fusion?
Hydrogen is what gets fused together to form Helium.
Helium can combine with what to form new substances?
helium does not combine with any element
What exactly is helium ash?
Helium ash is merely helium. Helium is commonly referred to as ash in discussions of our sun's fuel (and others stars of similar size/composition) to indicate that it cannot burn (or really cannot be fused into a larger atomic element). Our sun fuses hydrogen into helium at its core but the temperatures and pressures are not high enough to fuse helium, so it is called ash. If the core had a higher temperature/pressure, the helium would be fused into a larger element (carbon), something that happens with more massive stars. In such a star it would not be called ash because the conditions would be such that it could be fused ("burned"), so it would merely be called helium.
Explain why helium does not react with other element to form a compounds?
why helium does not react with other elements to form compounds
What is an element found in the form of a light gas?
Helium
What gas is the center of the sun made of?
- hydrogen nuclei waiting to be fused into helium and - helium which has been fused from hydrogen nuclei
