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Physics, 12.11.2020 18:50 knussoshd3603

The physical and chemical properties of elements change in predictable ways from one end of a period to another. Which of the following is true based on this feature of periodic table (p 312)?
A Potassium has more protons than Calcium
B An atom of gold is smaller (atomic size) than an atom of platinum
C The noble gases react with everything
D Elements in Group 8 are more reactive than elements in Group 7
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