PLEASE HELP THIS IS URGENT Magnesium has several isotopes. Atoms of three of these isotopes have 12, 13, and 14
neutrons, respectively. What is the atomic number, mass number, and number of protons and electrons of each of magnesium’s isatopes?

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

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive