a closed system will not gain or lose mass
It doesn't lose or gain
They gain or lose electrons, while the atoms combine.
gain 2
Most substances lose or gain energy when their temperature changes.
Ga3+ has 31 - 3 = 28 electrons
Lose
No. Atoms can gain and lose electrons but seldom gain or lose protons.
a closed system will not gain or lose mass
It doesn't lose or gain
It has 31 electrons. The easiest way to find an electron is that the atomic number tells you how many protons and electrons on the periodic table. It will change if the element is an ion which will gain or lose an electron.
They gain or lose electrons, while the atoms combine.
Neither lose nor gain.
gain
gain 2
gain
If you gain internal validity do you lose external validity