Answer: Gravity depends on two main factors.
Explanation: Those factors are mass and distance. I hope this helps!
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Water is the only polar compound so I guess that must be odd one out. I’m sorry I’m of no actual help.
Answer: 12 neutrons
Explanation: The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass). Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.
And an endothermic reaction, always treat heat as a reactant