Concentration is the amount of material dissolved in a measure of liquid?
true or false

True

Explanation:

the relative amount of a given substance contained within a solution or in a particular volume of space; the amount of solute per unit volume of solution;.

n has four pairs of electrons in the valence shell, electrons repel one another ,n has 7 protons in its nucleus, and since n has 7 protons, it must fill the second shell, giving it 4 pairs of electrons. the electrons form 3 bonds and 1 lone pair of electrons. each pair of electrons repels the other pairs, so they are equally far apart.

so all of the above

2b2t

explanation:

2b2t