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IGCSE O Level Chemistry Entrance Tests: Practice Test 2 (Chapter 14)
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In the periodic table, valence electrons are indicated by
Elements with 4-7 valence electrons are referred to as
If the nucleon (mass) and proton (atomic) number is 40 and 20 respectively, the element is
If the number of protons and electrons are 8 respectively, the valence electrons are
Elements in the same period may have
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