Does earth have a retrograde rotation

What neutral atom is isoelectronic to mn+4

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

While in europe, if you drive 125 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car’s gas mileage is 32.0 mi/gal? assume that 1 euro=1.26 dollars