What is stp? (list all standard pressures)
brainliest answer will be

STP in Chemistry stands for Standard Temperature and Pressure. STP most commonly use when dealing with gases, an example would be Gas Density

 The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atm pressure

The correct answer is A. -3

Explanation.

Protons and electrons have same magnitude but opposite charges. If number of electrons and protons are equal in an atom, then such atom will be neutral due cancellation of opposite charges.As in this case of nitride ion, protons are 7 but electrons are 10, it means 3 electrons are greater than protons tin numbers, so there will be negative charge (-3).

Note

Neutron are neutral.