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GCSE AQA Atomic structureAtoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. The number of subatomic particles in an atom can be calculated from the atom's atomic number and mass number. Part of Chemistry (Single Science) Atomic structure and the periodic table
quiz Test
Atomic number and mass numberAtomic numberThe number of protons in an atom of an element is its atomic number. Remember that:
An atom contains equal numbers of protons and electrons. Since protons and electrons have equal and opposite charges, this means that atoms are have no overall electrical charge. For example, the atomic number of sodium is 11. Every sodium atom has 11 protons and 11 electrons. It has 11 positive charges and 11 negative charges. Mass numbercurriculum-key-fact The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers, but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40. Calculating numbers of subatomic particlesThe symbol for an atom can be written to show its mass number at the top, and its atomic number at the bottom. To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number:
The atomic number of a sodium atom is 11 and its mass number is 23. Calculate the number of protons, neutrons and electrons it contains. Number of protons = 11 Number of electrons = 11 Number of neutrons (mass number - atomic number) = 23 - 11 = 12
GCSE Subjects
What is the mass of a neutron?neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67492749804 × 10−27 kg—marginally greater than that of the proton but 1,838.68 times greater than that of the electron.
What is the mass number of a neutron quizlet?the mass of an atom should be nearly the sum of the masses of its protons and neutrons. the mass of a proton and the mass of a neutron are each very close to 1 amu.
Where is the mass of a neutron?Neutron. What is a neutron quizlet?What is a neutron? a subatomic particle that has no charge and that is found in the nucleus of an atom.
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The mass of a neutron is Quizlet
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