An atom has 30 protons and 30 neutrons. What is its mass number?

How many molecules of sucrose c12h22o11 are there in 454 grams of sucrose

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

Classify this reaction: 2al+n2-> aln.