Jonas mixes citric acid with baking soda. How does he know the reaction is endothermic? A)the baking soda changes color B)the citric acid forms gas bubbles C)the temperature of the solution increases D)the temperature of the solution decreases

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

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

no but i do not usually comment or use my voice that much when it comes to social media

the answer would be a