An element has an atomic number of 19. Predict its valency and explain your reasoning.

A.VERIFIED ANSWERfact-checked by tutors

For an element with atomic number 19 (Potassium), the electron configuration is 2, 8, 8, 1. It has 1 valence electron. To achieve a stable octet, it is much easier for this atom to lose 1 electron than to gain 7. Therefore, its valency is 1.

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