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Is the atomic number of oxygen 8 because oxygen has a second shell with 8 electrons?
The atomic number of an element is the number of protons in its nucleus, which determines its chemical properties. Oxygen has an atomic number of 8 because it has 8 protons. The electrons in the outer shells of an atom can vary, but the number of protons remains constant.
What is an element atomic mass?
Atomic mass is the number of protons in an atom's nucleus. Since all atoms are, in their natural state, neutral, there are the same number of electrons as protons. Thus, the atomic mass tells you both the number of electrons and protons an atom has. No, this answer is incorrect. Atomic mass is the number of protons plus neutrons. Only the number of protons is equal to the number of electrons in a neutral atom; so knowing the atomic mass doesn't tell you the number of electrons, because you don't know the combination of protons and neutrons that were added together to get the atomic mass.
How do you know what electron number is in a neutral atom?
Number of electrons = number of protons = atomic number Mass number - number of neutrons = number of protons = number of electrons An ion will either have more or less electrons than protons, thereby making it a charged particle. It is "charged" because there is an abundance of electrons or protons that creates a positive or negative charge. The reason an atom loses or gains electrons to become a charged particle (ion: cation or anion) lies in the octet rule (see related question below). Ions are written with their charge in superscript after the elemental symbol: Li+, Mg+2, Cl-, K+, etc. The number indicates the number of protons or electrons that outnumber the opposite subatomic particle. For example, Mg+2 indicates that there are two more protons than electrons, creating a positive "2" charge. (If no number is given, then it is given that there is "one" more proton or electron). So if we know how many more or less electrons there are than protons, all we need to do is find the number of protons to compare it with. In the example above, there are two less electrons than protons in the magnesium ion. If all magnesium ions contain 12 protons, then there would have to be 10 electrons in the ion. To simplify: Number of protons (or atomic number) - charge of ion = number of electrons
Why is the atomic mass the same as the total number of protons and neutrons in the nucleus?
The atomic mass is the sum of the number of protons and neutrons in the nucleus because protons and neutrons have a mass of approximately 1 atomic mass unit each. Electrons are much lighter and do not significantly contribute to the overall mass of the atom.
How many protons does an atoms of oxygen have?
Oxygen has 8 protons. for this reason its atomic number is 8
How is the number of protons connected to the number of electrons in an atom?
In an atom, which is inherently neutral, the number of protons is equivalent to the number of electrons by reason of balanced relative electric charges.
Which element has 56 protons in its nucleus?
Barium. Atomic number 56 The reason for this is because Barium has 56 protons and the protons determin the atomic number (56).Also, that would be the same number of electrons. I hope this helped you :]
What is the definition of atomic mass number?
Atomic Mass is the sum of the number of protons and neutrons in the atom, plus any additional mass conferred by electrons. (Since electrons are roughly 1/1837th of a proton's mass, this additional mass is minuscule and is only represented in atoms that have atomic numbers at the higher end of the table.) It should be an integer/whole number.The reason that most elements have a number with decimals for their atomic mass numbers on the Periodic Table is because those numbers average all of the different isotopes of the element in proportion to how common they are. For example, Oxygen has an atomic mass number of 15.999 since the overwhelming majority of oxygens have 8 protons and 8 neutrons for a total atomic mass number of 16, but there are some rare oxygens with 8 protons and 7 neutrons for a total atomic mass number of 15. Once these are averaged, since the 16s are much more common, the resulting number is 15.999.
If you are given a aluminium sphere with a mass of 0.0679kg and its atomic number and mass number which is 13 and 26.982 respectively.The question is how many electrons in kg of a sphere?
I assume you mean how many electrons in 0.0679 kg? Or why else have that number. 0.0679 kg Al (1000 grams/1 kg)(1 mole Al/26.982 grams)(6.022 X 10^23/1 mole Al) = 1.5 X 10^24 atoms ------------------------------------now you were given that number 13 for a reason. that many electrons in aluminum 1.5 X 10^24 atoms Al * 13 electrons per atom Al = 1.97 X10^25 electrons in mass of aluminum ( might call it 2.0 X 10^25 )
What is the definitation of atomic number?
Atomic Mass is the sum of the number of protons and neutrons in the atom, plus any additional mass conferred by electrons. (Since electrons are roughly 1/1837th of a proton's mass, this additional mass is minuscule and is only represented in atoms that have atomic numbers at the higher end of the table.) It should be an integer/whole number.The reason that most elements have a number with decimals for their atomic mass numbers on the Periodic Table is because those numbers average all of the different isotopes of the element in proportion to how common they are. For example, Oxygen has an atomic mass number of 15.999 since the overwhelming majority of oxygens have 8 protons and 8 neutrons for a total atomic mass number of 16, but there are some rare oxygens with 8 protons and 7 neutrons for a total atomic mass number of 15. Once these are averaged, since the 16s are much more common, the resulting number is 15.999.
The number of protons in this atom is?
The number of protons in an atom is determined by its atomic number, which is a unique characteristic of each element. To find the number of protons in an atom, you can simply look up the element on the periodic table and the atomic number listed will tell you how many protons the atom has.
How is the mass number different from the atomic number of an atom?
Atomic number of an element is the number of protons that an atom of an element contains. The atomic weight (the mass of the atom) is measured by not only the mass of the proton(s), but by the mass of the nuetrons and electrons too.
