0
An element always contains the same number of protons - that is part of the definition. However, an atom also contains two other types of particle: electrons and neutrons. These both have mass, and the removal or addition of one or more of each also changes the mass of the atom involved.
- An ion is an atom that has gained or lost electrons, so that it has an unbalanced number of protons and electrons, and also an unbalanced electrical charge. Although very slight, there is a change in the overall mass of the atom (now an ion). Removing an electron to create an anion will make it slightly less massive than an atom of the same element and isotope; adding electrons to create a cation will make it very slightly more massive.
- The other, more noticeable way is by changing the number of neutrons. Atoms of the same element but differing numbers of neutrons are called isotopes, and almost all elements have several naturally existing istopes (with some having a huge numver of artificial ones as well). Because neutrons are so massive, adding or removing one, although somewhat harder to do than the same thing for an electron, alters the mass quite substantially: an atom of deuterium, 2H, is nearly twice as massive as one of protium, 1H. Changes are less impressive as atomic number (and mass) increases, but can still be quite large.
- Although the change in number of neitrons can outweighg a change in the number of electrons quite easily, there is no way for a change in the number of electrons to outweigh the change in neutrons. This is because a neutron weighs nearly 2000 times more than an electron, so an atom would have to lose or gain that many to make up for it, something that is currently known to be physically impossible.
What else can I help you with?
The mass of any two atoms of the same element is always the same?
The masses of any two atoms of the same element are not always the same. Atomic mass (the mass you see on the periodic table) is just a weighted average of all of the weights of all of the different isotopes of an element.
Every balanced chemical equation each side has the same number of?
same number of each element
Atoms of the same element with different atomic masses?
Isotopes are atoms of the same element with different atomic masses, characterized by the number of neutrons in the nucleus. Despite having different masses, isotopes share the same number of protons and electrons. Certain isotopes may be unstable, leading to radioactive decay.
How do you know if two atoms are from the same element?
Two atoms are from the same element if they have the same number of protons in their nuclei. This is the defining characteristic that determines an element's identity. For example, all carbon atoms have 6 protons, so any two atoms with 6 protons are considered to be the same element, carbon.
Not all of Daltons rules were completely true as scientists later learned Matter is made of atoms and different elements are made of different atoms But not all atoms of a particular element are?
Dalton's atomic theory proposed that all atoms of a particular element are identical, which we now know is not entirely true. Isotopes are atoms of the same element with different numbers of neutrons, leading to variations in atomic mass. This discovery challenged Dalton's rule of identical atoms for a given element.
Where are the mass variances in 2 atoms of the same element and why do they occur?
If the chemical element has isotopes, each isotope has a specific and different atomic mass.
How is it possible for two different atoms to have the same atomic mass?
They would have to be atoms of the same element, and the same isotope of that element.
The mass of any two atoms of the same element is always the same?
The masses of any two atoms of the same element are not always the same. Atomic mass (the mass you see on the periodic table) is just a weighted average of all of the weights of all of the different isotopes of an element.
When 2 atoms appear to have same atomic mass?
When they are of the same element.
What are atoms with the same atomic number but different mass called?
Atoms with the same atomic number are all atoms of the same element. However, if the atoms have different molecular weights, they are isotopes of the same element.
Which of the atoms in the table are atoms of the same element?
To determine which atoms in a table are of the same element, you would look for atoms that have the same atomic number, as this identifies the element. Atoms of the same element will also have the same number of protons in their nucleus. If isotopes of an element are present, they will have the same atomic number but different mass numbers due to varying numbers of neutrons.
What are atoms of the same element have different mass numbers?
Isotopes.Isotopes.
Isotopes are atoms of the same element that different numbers of?
Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei. This leads to variations in atomic mass for isotopes of the same element.
The molar mass of an element is equal to?
The element's average atomic mass.
Are all sample of elements are composed of atoms with same atomic mass?
No, different samples of an element can have varying atomic masses due to the presence of isotopes. Isotopes are atoms of the same element with different numbers of neutrons, leading to different atomic masses.
Atoms of the same element with different mass numbers are known as?
Isotopes.
Why is there an average atomic mass?
There is an average atomic mass because all atoms of the same element do not have the same amount of neutrons (isotopes), therefore variations in atomic mass exist. The average atomic mass of an element is the estimated average of all the atoms of the same element, given the average of different isotopes in a scientific sample.
