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What is the maximum number of electrons that can fit into the second shell?
What atom has the electron configuration 2,8,5?
Which atom is the most stable: F, Ne, Na?
Which of these elements has two electrons in its outer shell?
Which of these elements has three occupied electron shells?
What is the electron configuration of calcium?
What element is in Period 2, Group 7?
What is present at the centre of an atom?
Which sub-atomic particle has a mass of 1 and no charge?
What name is given to different versions of atoms that have the same number of protons but different numbers of neutrons?
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