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R=RoA1/3 where Ro = 1.2 fm and A= mass no.
So R= 1.2 (216)1/3 = 1.2 X 6 = 7.2 femtometers or 7.2 X 10-15 m
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What determine an atoms size?
The atomic radius depends on the the number of electron shells, total negative charge, positive charge of the nucleus, atomic mass.
What is the difference between atomic size and atomic number?
The atomic number of an element determines the number of protons that are present in that element. The atomic size refers to the distance that the outermost valence electrons are from the nucleus.
What is the mass of the nucleus compared to the mass of the entire atom?
The difference between the mass of the nucleus and the mass of the atom is virtually negligible.The atom is mainly empty space! The radius of the atom is ~10 000 times the radius of the nucleus.That means that the volume of the atom:volume of the nucleus = 1000 000 000 000:1 or= 1012:1Think about the volume of a grain of sand to the volume of a football stadium if the stadium was a complete three dimensional sphere type structure.
What makes up most of the size of an atom?
Most of the mass is in the nucleus; most of the volume is in the electron "cloud".
How is the atomic mass determined?
Atomic Mass is the number of protons in an atom plus the number of neutrons in the same atom.
What is the sum of a proton and nuetrons in the nucleus of an atom?
Its the mass number of an atom.The mass of an atom is concentrated in the nucleus. Both protons and neutrons which are collectively known as nucleons are found within the nucleus.Mass of electrons are not considered to be contributing towards the mass no. of an atom as their size is small and thus their mass is negligible.
What determine an atoms size?
The atomic radius depends on the the number of electron shells, total negative charge, positive charge of the nucleus, atomic mass.
What is the definition of actual mass?
The actual mass number is the total number of neutrons and protons in the nucleus of an atom. Atoms commonly have varying numbers of neutrons in the same element, these variants are referred to as isotopes.
What must be true of the nucleus of atoms of a substance to call it an element?
It needs at least one proton. The periodic table is arranged, in one aspect, based on the ascending number of protons. The size and mass of the nucleus is determined by the number of protons and neutrons. Neutrons are NOT required to form an element.
What is the difference between atomic size and atomic number?
The atomic number of an element determines the number of protons that are present in that element. The atomic size refers to the distance that the outermost valence electrons are from the nucleus.
What is the mass of the nucleus compared to the mass of the entire atom?
The difference between the mass of the nucleus and the mass of the atom is virtually negligible.The atom is mainly empty space! The radius of the atom is ~10 000 times the radius of the nucleus.That means that the volume of the atom:volume of the nucleus = 1000 000 000 000:1 or= 1012:1Think about the volume of a grain of sand to the volume of a football stadium if the stadium was a complete three dimensional sphere type structure.
What makes up most of the size of an atom?
Most of the mass is in the nucleus; most of the volume is in the electron "cloud".
Where is the most of an atom found?
The nucleus has most of the mass (weight) of an atom. The size of the atom, however, is related to its electron cloud (i.e. to the electrons that orbit around the nucleus)
Which contributes more to an atoms size?
The mass number
Suggest a reason why the nucleus can be observed in some cells but not the others?
some cells did not contain nucleus such as red blood.AND THE SIZE OF THE NUCLEUS IS DIRECTLY PROPORTIONAL TO THE CYTOPLASM AND THE NUMBER OF CHROMOSOMES
How atom are measured?
You mean the number or size or mass? For number of atoms present in a substance we have to follow Avogadro's rule. If you take 12 g of carbon substance, then there you will have 6.023 x 1023 atoms in it. Same way, as you take nearly some 71 g of chlorine gas, there, we will have 6.023 x 1023 number of chlorine molecules in it. If you have 238 g of Uranium-238 isotope, then same number 6.023 x 1023 of Uranium atoms are obtained. Now about the size of the atom. Atom's structure is that it has a nucleus at its centre and electrons are going around that nucleus. The size of the nucleus is obtained, first time, by the famous alpha particle scattering experiment and is found to be of the order of 10-15m. The radius of the atom is considered to be the radius of the electron's orbit around the nucleus. Bohr's theory opened the gate way to get the radius of the orbit as of the order of 10-11m. So, compared to the size of the atom, nucleus occupies only a smaller place ie 10,000 times smaller. So in between the electrons' orbit and nucleus there is nothing other than free space. If you want to know how the mass of the atom has been measured, you must go through the famous Bain bridge's mass spectroscope which finds the mass of the isotopes so accurately. It is found to be the order of 10-27kg.
What is the size of protons in a uranium nucleus?
A proton has identical properties in all types of atoms; the mass of a proton is approx. 1 amu.
