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What is thought to be the physical mechanism that was responsible for the present mix of chemical elements in the universe?
1) Hydrogen and some helium and a fairly small amount of lithium were formed very shortly after the start of the Universe, when matter cooled down enough for quarks to join into nucleons, and for some nucleons to join into heavier elements. There wasn't enough time to form any of the heavier elements.
2) The heavier elements - the so-called metals - were formed inside of stars, by nuclear fusion. In some cases, significant amounts of this matter went back into space, in supernova explosions.
For additional information, I suggest searching Wikipedia or Google for the following topics:
- Nucleosynthesis
- Supernova
- Metallicity
- Nuclear fusion
What else can I help you with?
What elements have similar chemical and physical properties.?
elements in the same group
When the repeating chemical and physical properties of elements change periodically with the elements' atomic numbers it is called the?
The answer to, ' when repeating chemical and physical properties of elements change periodically with the elements' atomic numbers it is called the?'Periodic law, is the answer. PERIODIC LAW !orPeriodicity of the chemical elements properties.
What sets of elements have similar physical and chemical properties?
Except noble gases the groups of elements in periodic table have the similar chemical properties but not the physical.
What statement can be made when compairing the chemical and physical properties between a compound and the elements from which it is formed?
The chemical and physical properties of a compound are different than those of the elements from which it is formed.
What is similar when elements have the same group?
Elements in the same group have similar physical and chemical properties.
Elements in a column are called . These elements have similar chemical and physical properties.?
These elements have similar chemical and physical properties.
When table salt forms from its elements is it chemical or physical change?
It is chemical. It is chemical because when salt is formed from elements it becomes a chemical and not a physical.
What cannot be seperated by physical means?
Elements
When the repeating chemical and physical properties of elements change periodically with the elements atomic numbers it is?
The answer to, ' when repeating chemical and physical properties of elements change periodically with the elements' atomic numbers it is called the?'Periodic law, is the answer. PERIODIC LAW !orPeriodicity of the chemical elements properties.
What elements have similar chemical and physical properties.?
elements in the same group
What can be seprated by chemical means but not by physical means?
The elements of a chemical compound can be separated only by chemical means, but not by physical means.
When the repeating chemical and physical properties of elements change periodically with the elements atomic numbers is called?
The answer to, ' when repeating chemical and physical properties of elements change periodically with the elements' atomic numbers it is called the?'Periodic law, is the answer. PERIODIC LAW !orPeriodicity of the chemical elements properties.
When the repeating chemical and physical properties of elements change periodically with the elements' atomic numbers it is called the?
The answer to, ' when repeating chemical and physical properties of elements change periodically with the elements' atomic numbers it is called the?'Periodic law, is the answer. PERIODIC LAW !orPeriodicity of the chemical elements properties.
What sets of elements have similar physical and chemical properties?
Except noble gases the groups of elements in periodic table have the similar chemical properties but not the physical.
Which elements have similar chemical and physical properties?
it is the ~group~ of the periodic table of elements
When elements combine to form compounds is this a physical or chemical change?
This is a chemical change.
Is cadmium chemical or physical property?
Cadmium is an element. Like all elements it has both physical and chemical properties.
