Can nRF51822 drive LED directly by GPIO?

Now I have a project to build the schematic.

a, 5 LED indicators(0603) were driven individually by GPIO port directly, serial with resistor, then pull down to GND. Is it enough power to drive the LED? or must pull up the LED to VDD connection?

b. The GPIO connect to NMOSFET Gate to control the vibrating motor. Must the GPIO port connect to Pull-Down resitor? What's the pull-down resistor value?