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The atomic number of an atom is the number of...
Protons
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The mass number of an atom is the number of...
The number of protons and neutrons
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What is present at the centre of an atom?
Nucleus/Protons & Neutrons
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Which sub-atomic particle has a mass of 1 and no charge?
Neutrons
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What name is given to different versions of atoms that have the same number of protons but different numbers of neutrons?
Isotopes
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What is the maximum number of electrons that can fit into the second shell?
8
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What atom has the electron configuration 2,8,5?
Phosphorus
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Which atom is the most stable: F, Ne, Na?
Ne,Neon
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Which of these elements has two electrons in its outer shell? :
Ba
Pb
At
Ba,Barium
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Which of these elements has three occupied electron shells? :
Boron
Silicon
Potassium
Silicon
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What is the electron configuration of calcium?
2,8,8,2
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What element is in Period 2, Group 7? :
Helium
Radium
Fluorine
Fluorine
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