These electron configurations are NOT valid, determine what is wrong with them: 19) 1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p5

20) 1s2 2s2 2p6 3s2 3d5

21) [Ra] 7s2 5f8

22) [Xe]

|>GIVING BRAINLIEST<|
-WORTH 15 POINTS-

Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? (a)gamma rays (b)visible light (c)infrared light (d)microwaves

Avoltaic cell converts chemical energy to

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?