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Periodic Table quick check

A quick check of 3 questions. After you submit, each question shows the right answer and why.

3 of 8 questions, Advanced level. Aimed at the Advanced level, your current depth. Questions you have not answered yet come first.

Show all 8 questions

ScientistQuestion 1 of 3

Fluorine and chlorine are both in group 17. Predict the usual charge on their ions and explain using the table.

AdvancedQuestion 2 of 3

Which element is the most electronegative, consistent with the periodic trend?

AdvancedQuestion 3 of 3

Mendeleev predicted an atomic weight of about 68 for 'eka-aluminium'. Gallium, discovered in 1875, has 69.72. What does this show?