35m/s west can be an answer in velocity true or false

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?

Which of the following compounds would be primarily ionic? methane, ch4, ammonia nh3, calcium chloride, cacl2, or carbon dioxide, co2