Which of the following elements has this electron dot diagram a) oxygen, sulfur b) magnesium, calcium c) lithium, flourine d) none of the above

Give the ground-state electron configuration for each of the following elements. (a) Nitrogen (b) Helium

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Disscuss why technetium and promethium have whole number atomic masses and have a bracket symbol on the periodic table.

Which one in each pair has the larger radius ? Explain. (a) a magnesium ion or an aluminum ion (b) a sodium atom or a silicon atom (c) a potassium ion or bromide ion

State the predicted ionic charge of nonmetal ions in each of the following groups of elements. (a) Group IVA/14                                                                                              (b) Group VA/15 (c) Group VIA/16                                                                                                  (d) Group VIIA/17

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draw a shell model of a lithium atom which has three protons then predict wether the majority of lithium atoms on  earth are uncharged positively charged or negatively charged