(2) hydrogen ion contains 1 electron and 1 proton, H+ ion forms when H ion lost an electron, and therefore it’s is the same thing as a proton 6. What is the chemical formula for a hydronium ion? (1) H3O+ 7. Show the relationship between a proton and a hydronium ion. Explain why one is essentially the same as the other.
CHAPTER 10 - Radioactivity and Nuclear Processes Composition of atomic nucleus - neutrons and protons Nuclides are nucleus of different isotopes, which is represented by the symbol [pic]X - X being symbol of the element. A is the mass number, which is the sum of number of protons & neutrons; Z is the atomic number, the number of protons, which also represents the nuclear charge. Number of neutrons = (A – Z). For example, the symbol of carbon-14 nuclide is [pic]C, which means a carbon-14 nuclide has 6 protons and 8 neutrons. The nuclide symbol of lead-206 is [pic]Pb.
As for, the positive charges are found in the protons while the negative charges are found in the electrons. That’s why; all atoms must have the same amount of protons and neutrons, to have a neutral combination between both positive and negative charges. A single unit of proton is known to have +1 elementary charge; as for a single unit of an electron has a -1 elementary charge. Take any random atom, it is known to have 5 protons and 7 neutrons; so it has a +5 (positive) elementary charge and a -7 (negative) elementary charge, overall it has a -2 (elementary charge) and that is a negative net charge from the resulting combination of the electrons and protons. Any atoms, which don’t have an equal amount of both protons and electrons, are all referred as ions.
In chemistry, if you want to refer to a certain isotope you must write it as such: AXZ. X represents the chemical symbol of the element, Z represents the atomic number, and A represents the mass number which is the number of protons and neutrons combined. For example if one were to refer to a hydrogen isotope, they would write it as 1H1 (ordinary hydrogen), 2H1 (deuterium-hydrogen isotope with one neutron), or 3H1 (tritium-isotope with two neutrons). Light elements usually have an equal amount of neutrons and protons; heavy elements need more neutrons than protons in order to stick together. Atoms with too many neutrons, or not enough, can exist for a while, but they will be unstable.
A. barium sulphate B. calcium carbonate C. silver chloride D. sodium nitrate 3. An element X forms a hydroxide, which dissolves, both in acids and in alkalis. What could X be? A. aluminium B. calcium C. copper D. iron 4. In which reaction is dilute sulphuric acid not behaving as an acid?
The first shell can hold up to 2 electrons, second shell can hold up to 8 electrons, third shell can hold up to 18 electrons and the fourth shell can hold up to 32 electrons. The electron configuration is determined by the number of electrons in the outer valance shell and it is used to describe the orbitals which are occupied by the electrons of the atom. The Bohr model of the quantum atom is considered as the cornerstone of quantum mechanics even though it is fundamentally incorrect for all atoms other than hydrogen because Bohr proposed the idea of quantisation for hydrogen’s electronic structure also he was able to explain the emission spectra of hydrogen as thoroughly as other one-electron system. Bohr used spectral evidence to test his atomic theory and he was able to predict that the energy emitted and absorbed by an electron when it changes orbitals would be equivalent to a certain wavelength of electromagnetic radiation and it is possible for it to be measured. He found evidence of his theory of atomic structure which he studied about the spectra and which he chose a specific one which was the hydrogen
Purpose of investigation: Picture 3 The purpose of this investigation was to see if concentration affects the rate of reaction between Magnesium and Hydrochloric acid. Magnesium is one of the key reactants in the experiment. Magnesium is a chemical element found in the periodic table with the chemical abbreviation of ‘Mg’.It is a soft, light, silver/white metal and has an atomic number of 12 and an atomic mass of 24 and is the eighth most abundant element on the earth . It is an alkaline earth metal and consists of 12 protons, 12 neutrons and 12 electrons. However the number of neutrons differs as there are different isotopes of Magnesium (Mg, solid).
Gallium, indium, aluminium, boron. Indium, gallium, aluminium, boron. JSC 2006, Physical Science [Turn over 2 5 The combination of protons, neutrons and electrons for a neutral atom of magnesium, 24 Mg, is: protons electrons A 10 14 11 B 11 13 12 C 12 12 12 D 6 neutrons 12 12 10 Which structure represents an atom of the noble gas in the first period. e e e pn np np pn n np p e e e e e e A 7 e e e pnn pnn npp e B C e e e D A mixture containing a soluble salt, sand and iron filings, can be separated into its components using techniques: R: use of
5. 5. II. Mass Defect and Nuclear Binding Energy Consider a helium-4 atom: (_______ protons, _________ neutrons, and __________ electrons) Recall: 1 proton = 1.007277 u, 1 neutron = 1.008665 u, and 1 electron = 0.000548 u We would expect the mass of a helium-4 atom to be as follows: 2(1.007277 u) + 2(1.008665) + 2(0.000548) = 4.032980 u However the observed mass of a helium-4 atom is 4.002596 u!!!!!! There is a difference of 0.030384 u between the observed mass and the calculated mass.