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This element is oxygen.
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∙ 6y ago
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What element is for times the atomic mass of helium?
Well, two times four is eight, which would be oxygen.
The relative atomic mass of an atom can be found by comparing the mass of the atom to the mass of?
The Hydrogen atom. Beware, Hydrogen has an atomic mass based on one proton, as it doesn't have a neutron. So Helium has a mass of four times Hydrogen.
What four pieces of information about each element is found on the periodic table?
Well the four main types really go down to the Atomic Number, Atomic Mass, The Chemical/Atomic symbol, and the elements name of course. But different tables vary.
What type of nuclear reaction results in a single nucleus undergoing a decrease in atomic number and the release of a helium nucleus?
This is emission of an alpha particle which is a helium nucleus. Thus the atomic number decreases by two and the atomic weight by four, in such a radioactive decay
Why hydrogen diffuses four times more than helium?
because the mass of hydrogen is less than that of helium
What element is for times the atomic mass of helium?
Well, two times four is eight, which would be oxygen.
What are First four steps of He fusion after Be?
The first four: 1. Be 2. C 3. O 4. Ne How I found this: Since Helium (He) has an atomic number of 2, add two to the atomic number of Be. Since the atomic number of Be is 4, and the atomic number of Helium is 2, you would add four plus two, which equals six. Carbon has an atomic number of six, so therefore it would be your next answer. The formula is the atomic number of Helium plus the atomic number of element you are provided with equals the atomic number of your answer. In simpler terms: atomic number of He+atomic number= atomic number of answer
The relative atomic mass of an atom can be found by comparing the mass of the atom to the mass of?
The Hydrogen atom. Beware, Hydrogen has an atomic mass based on one proton, as it doesn't have a neutron. So Helium has a mass of four times Hydrogen.
What four pieces of information about each element is found on the periodic table?
Well the four main types really go down to the Atomic Number, Atomic Mass, The Chemical/Atomic symbol, and the elements name of course. But different tables vary.
What are the four element that have atomic number less than 8?
There are seven elements with atomic number less than 8: hydrogen, helium, lithium, beryllium, boron, carbon, and nitrogen. I don't know where you got the notion that there were only four. I thought you might be thinking of atomic mass instead, but that doesn't work either ... there are only 3 elements that have stable isotopes with a mass below 8 amu (hydrogen, helium, and lithium). 7Be exists, but it's radioactive.
What type of nuclear reaction results in a single nucleus undergoing a decrease in atomic number and the release of a helium nucleus?
This is emission of an alpha particle which is a helium nucleus. Thus the atomic number decreases by two and the atomic weight by four, in such a radioactive decay
Is it a lucky accident that avogadro's number of helium atoms weight exactly four grams?
No, it is not a lucky accident. An Avogadro's number of helium atoms do not weigh 4 grams: their mass is four grams and that is NOT the same thing. The mass is related to the atomic mass unit which is, essentially the number of protons and neutrons in an atom. More accurately, it is the weighted average for the atomic mass across the isotopes of the element - weighted according their abundance.
What does the periodic table contain?
The four pieces of information in each box of most periodic tables are the element's name, the element's symbol, the element's average atomic weight and the element's atomic number. Other periodic tables have other information, but standard periodic tables almost always have those four.
What was important about atomic theory?
It disproved Aristotle's four-element theory of matter.
Why hydrogen diffuses four times more than helium?
because the mass of hydrogen is less than that of helium
What is the relative atomic mass of lead?
The element lead consists of four naturally occurring isotopes with atomic masses 203.97302, 205.97444, 206.97587, and 207.97663 . The relative abundances of these four isotopes are 1.4, 24.1, 22.1, and 52.4%, respectively.
How many atoms are in He4?
He4 would contain four atoms, if it were possible for helium to combine that way.4He (which is pronounced "helium four") is a single atom, with the 4 being the number of nucleons (and thus the approximate atomic weight).
