Number of proton K=19
so, 42 - 19 =23
then the answer in 19 protons and 23 neutrons
Answer : 135 grams of sodium has 5.869 moles.
Solution : Given,
Mass of sodium = 135 grams
Molar mass of sodium = 23 g/mole
Formula used :

Now put all the given values in this formula, we get

Therefore, the moles of sodium present in 135 grams of sodium is, 5.869 moles.
Answer:
2.00X10^5 x 20gNe/6.02x10^23=6.46x10^-18 but books answer is 797.
Explanation:
Long term because if you leave something out to be weathered then it can’t be unweathered because of the drastic change of the object.
Answer: B
Explaining: surface currents are caused by wind density affects deep ocean currents