A. 3
B. 4
C. 15
D. 31
Correct Answer:
Option A = 3
Explanation
The element is Phosphorus in group 5 with valencies of 3 and 5.
How many valence electrons are contained in the element 31//15P?
![If 1 mole of sodium contains 6 x 10²³ atoms, how many atoms are contained in 0.6 g of sodium? [Na = 23]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "If 1 mole of sodium contains 6 x 10²³ atoms, how many atoms are contained in 0.6 g of sodium? [Na = 23]")
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