Rank the species (amide ion, ammonia, or ammonium ion) from the largest to the smallest H−N−HH−N−H bond angle? Rank from largest to smallest H−N−HH−N−H bond angle. To rank items as equivalent, overlap them.

H-N-H bond in Amide> H-N-H bond in Ammonium > H-N-H bond in ammonia

Explanation:

Amide has a planar shape with 120° H-N-H bond, ammonium has a tetrahedral shaped H-N-H bond of 109°, while ammonia has a pyramidal geometry of H-N-H bond angle of 107°

your answer would be a. 12.5 kg

particle   p is an electron and particle q is a neutron