The answer is O2.
The ionic charge of something can be determined by it's place in the periodic table.
Reaction of sodium with water
Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic. During the reaction, the sodium metal may well become so hot that it catches fire and burns with a characteristic orange colour. The reaction is slower than that of potassium (immediately below sodium in the periodic table), but faster than that of lithium (immediately above sodium in the periodic table).
2Na(s) + 2H2O → 2NaOH(aq) + H2(g)
It is called a watt and or wattage
The answer is b because if you’re fan is blowing and you spend it the opposite way, the air will be cooler
Polarity, cohesion, adhesion, surface tension, high specific heat, and evaporating cooling
