How do you find the atomic weight of an isotope?
The chlorine isotope with 18 neutrons has an abundance of 0.7577 and a mass number of 35 amu. To calculate the average atomic mass, multiply the fraction by the mass number for each isotope, then add them together.
What is the mass of an isotope of this atom that has 2 neutrons?
Tritium. H is known as tritium and contains one proton and two neutrons in its nucleus (mass number = 3).
What isotope has 2 neutrons?
Do isotopes have extra neutrons?
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
How do you know if an isotope is radioactive?
An unstable isotope emits some kind of radiation, that is it is radioactive. A stable isotope is one that does not emit radiation, or, if it does its half-life is too long to have been measured. It is believed that the stability of the nucleus of an isotope is determined by the ratio of neutrons to protons.
Why are radioactive isotopes harmful to human life?
Radioactive materials are hazardous. Nuclear radiation can ionise chemicals within a body, which changes the way the cells behave. It can also deposit large amounts of energy into the body, which can damage or destroy cells completely. Radioactive isotopes can sit in the stomach and irradiate for a long time.
What is the atomic number of an isotope?
The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons.
What does the symbol carbon 12 mean?
View this answer. The 12 in carbon-12 is the mass number of the isotope. This means that all atoms of carbon-12 have a mass of 12 atomic mass units.
How many neutrons are in oxygen?
How do atoms differ?
Normally, the number of electrons is equal to the number of protons, which makes atoms electrically neutral. The number of protons in an atom is the defining feature of an atom. It’s what makes one element different from another. The number of protons in an atom is called its atomic number.
Are atoms really indivisible?
Atoms are not indivisible or indestructible. While all atoms of a given element do have the same number of protons which gives them a great deal of their chemical character, they can vary in their mass and properties by changes in their number of neutrons and electrons.
What does the atomic number stand for?
Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.
How is atomic weight determined?
The total weight of an atom is called the atomic weight. It is approximately equal to the number of protons and neutrons, with a little extra added by the electrons.