Which elements have 50protons

At 300K, the pressure inside a gas-filled container is 500 kPa. If the pressure inside decreases to 100 kPa, but the volume remains the same, what is the final temperature of the gas? Answers: A.) 240 K B.) 180 K C.) 30 K D.) 60 K

A metal (ii) ion solution of unknown concentration shows an absorbance of 0.55. what is the molar concentration of the metal (ii) ion in the sample

Which ones have acid which ones dont NaCI CO2 H2SO4 HCI CaSO4 H3BO3 KBr

Does rimmed steel contain nickel?

What is the metal with 4 valence electrons and a mass greater than 200?

If a house viewed through infrared goggles, where would the most seen Answers A. In the basement B. Along a wall C. On the wall D. Near the roof

Recommend an element use to fill bottles that contain ancient paper. the element should be a gas at room temperature, should be denser than helium, and should not easily react with other elements.

I'm named after a very famous scientist. who am I? (Periodic table)

What conversion factor is present in almost all stoichiometry calculations?

What are the red blood cells