Atomic Structure and mass 0.0 / 5 ? ChemistryAtoms and compoundsIGCSECIE Created by: KristenvermaakCreated on: 15-03-23 12:22 What is the unit to measure the size of atoms? Relative atomic mass is used. 1 of 16 What is the relative atomic mass? The average mass of the isotopes of an element compared to 1/12th of the mass of an atom of C-12. 2 of 16 What is the symbol for relative atomic mass? Ar 3 of 16 What is the relative atomic mass unit equal to? It is equal to a 1/12th mass of a carbon-12 atoms. 4 of 16 What are the other elements measured relative to? Masses are measured relative to carbon-12 mass. 5 of 16 What equation do you use to work out the relative atomic mass of an element? (% of isotope 1 x mass number of isotope 1) + ( % of isotope 2 x mass number of isotope 2) divided by 100. 6 of 16 What are the relative mass and charge of sub-atomic particles? Electron: -1 charge and 1/1840 relative mass Proton: +1 charge and 1 relative mass Neutron: 0 charge (neutral) and 1 relative mass 7 of 16 What is the atomic or proton number? is the number of protons in the nucleus of the atom. 8 of 16 What is the nucleon number? The number of protons and neutrons in the nucleus of an atom. 9 of 16 How do you calculate the number of neutrons of an atom? You calculate the number of neutrons by subtracting the neutron and mass number from the proton number. 10 of 16 What determines which element a substance is? The atomic number of an atom or ion determines what element it is. 11 of 16 What do the atoms and ions of the same element have in common? They have the same number of protons. 12 of 16 How do you calculate the mass number? The number of protons + the number of neutrons. 13 of 16 How do you calculate the number of protons? Mass number - number of neutrons 14 of 16 How do you work out the number of electrons? An atom is neutral so has equal number of protons and electrons. 15 of 16 How do you calculate the number of neutrons? Mass number - atomic number 16 of 16
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