According to Dalton's atomic theory chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction (it is possible only during nuclear reactions and radioactive disintegration).
A mole of atoms of any element contains the same number of atoms, which is Avogadro's number (6.022 x 10^23). Therefore, a mole of atoms of one element is equivalent in quantity to a mole of atoms of another element. The only difference lies in the atomic weight of the elements.
To convert from grams to atoms, you need to use Avogadro's number (6.022 x 10^23 atoms/mol) to convert the given amount of substance into moles and then multiply by Avogadro's number to get the number of atoms. To convert from mass (in grams) to the number of atoms, first find the molar mass of the substance, then divide the given mass by the molar mass to get moles, and finally multiply by Avogadro's number to obtain the number of atoms.
Yes, different isotopes of the same element have different masses.
the size
Each atom of an isotope of beryllium (or of another element) is different from the atoms of an other isotope. But all the atoms of an isotope are identical.
According to Dalton's atomic theory chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction (it is possible only during nuclear reactions and radioactive disintegration).
No, according to Dalton's theory, atoms of one element cannot be converted into atoms of another. Atoms are indivisible and cannot be created or destroyed in a chemical reaction. This concept is known as the conservation of matter.
In a nuclear decay sequence it is possible for heavier atoms to decay to a lighter element.
Chemistry
Yes
They would have to be atoms of the same element, and the same isotope of that element.
During chemical reactions atoms remain unchanged.
By number of protons/electrons.
When atoms of one element chemically join with another element, they form molecules or compounds. In these compounds, the atoms are held together by chemical bonds resulting from the sharing or transfer of electrons.
A mole of atoms of any element contains the same number of atoms, which is Avogadro's number (6.022 x 10^23). Therefore, a mole of atoms of one element is equivalent in quantity to a mole of atoms of another element. The only difference lies in the atomic weight of the elements.
The likely word is animosity (ill feeling, hostility).Another possible word is atomicity, used to mean valence of an element's atoms.
It is possible that "2Fe" refers to two atoms of the element iron (Fe). Iron is a metallic element with the atomic number 26.