The atomic number of an atom is the number of:Protons plus electronsNeutronsProtonsProtons plus neutrons3The relative atomic mass of an atom is the number of:Protons plus electronsProtons plus neutronsProtonsNeutrons4Referring to the periodic table, calculate how many neutrons are found in sodium (Na):23011125An atom has 12 electrons. Use the periodic table to identify the chemical symbol for this atom:CMgKO
Question
The atomic number of an atom is the number of:Protons plus electronsNeutronsProtonsProtons plus neutrons3The relative atomic mass of an atom is the number of:Protons plus electronsProtons plus neutronsProtonsNeutrons4Referring to the periodic table, calculate how many neutrons are found in sodium (Na):23011125An atom has 12 electrons. Use the periodic table to identify the chemical symbol for this atom:CMgKO
Solution
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The atomic number of an atom is the number of protons.
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The relative atomic mass of an atom is the number of protons plus neutrons.
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Sodium (Na) has an atomic number of 11 and a relative atomic mass of 23. The number of neutrons is calculated by subtracting the atomic number from the relative atomic mass. So, Sodium has 23 - 11 = 12 neutrons.
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An atom with 12 electrons has an atomic number of 12, which corresponds to Magnesium (Mg) on the periodic table.
Similar Questions
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